jquery-calx-2.2.7.js

/**
 * jQuery Calx 2.2.7
 *
 * author       : Xsanisty Developer Team <developers@xsanisty.com>
 *                Ikhsan Agustian <ikhsan017@gmail.com>
 * website      : http://www.xsanisty.com/project/calx2
 * repository   : https://github.com/xsanisty/jquery-calx
 * license      : MIT
 */

if(typeof(Zepto)     == 'undefined'){
    Zepto    = undefined;
}
if(typeof(jQuery)    == 'undefined'){
    jQuery   = Zepto;
}
if(typeof(numeral)   == 'undefined'){
    numeral  = undefined;
}
if(typeof(moment)    == 'undefined'){
    moment   = undefined;
}
if(typeof(jStat)     == 'undefined'){
    jStat    = undefined;
}

(function($, numeral, moment, jStat){

    if(typeof($) == 'undefined'){
        return false;
    }
    
    /************************************************
     *                Begin of IE Hack              *
     ************************************************/
    //ie support for Array.indexOf
    if (typeof Array.indexOf !== "function") {
        Array.prototype.indexOf = function(obj, start) {
            for (var i = (start || 0); i < this.length; i++) {
                if (this[i] == obj) {
                    return i;
                }
            }
            return -1;
        };
    }

    //ie support for getPrototypeOf
    if (typeof Object.getPrototypeOf !== "function") {
        if (typeof "test".__proto__ === "object") {
            Object.getPrototypeOf = function(object) {
                return object.__proto__;
            };
        } else {
            Object.getPrototypeOf = function(object) {
                // May break if the constructor has been tampered with
                return object.constructor.prototype;
            };
        }
    }/************************************************
 *             Default Configuration            *
 ************************************************/

var defaultConfig = {
    /** tell calx to perform auto calculate after change has been made or trigger calculation manually */
    autoCalculate         : true,

    /** event that trigger calculation to be executed */
    autoCalculateTrigger  : 'blur',

    /** callback triggered right before calculation is performed */
    onBeforeCalculate     : null ,

    /** callback triggered right after calculation is performed */
    onAfterCalculate      : null ,

    /** callback triggered right before calculation result is applied */
    onBeforeRender         : null ,

    /** callback triggered right after calculation result is applied */
    onAfterRender          : null ,

    /** default fomatting rule when data-format is not present */
    defaultFormat         : false,

    /** used for server side formula */
    ajaxUrl               : null,

    /** ajax method used for requesting formula result */
    ajaxMethod            : 'get',

    /** Available option is morris, highchart, d3 */
    graphHandler          : 'flot',

    /** check for circular reference on init, default false */
    checkCircularReference: false,

    /** the sheet data contain list of cells with value, formula, and format */
    data                  : {}

};function parserFactory(sheet) {

    var parser = {
        trace: function trace() {},
        yy: {},
        symbols_: {
            "error": 2,
            "expressions": 3,
            "e": 4,
            "EOF": 5,
            "variableSequence": 6,
            "TRUE": 7,
            "FALSE": 8,
            "NULL": 9,
            "TIME_AMPM": 10,
            "TIME_24": 11,
            "number": 12,
            "STRING": 13,
            "&": 14,
            "=": 15,
            "+": 16,
            "(": 17,
            ")": 18,
            "[": 19,
            "expseq": 20,
            "]": 21,
            "<": 22,
            ">": 23,
            "NOT": 24,
            "-": 25,
            "*": 26,
            "/": 27,
            "^": 28,
            "E": 29,
            "FUNCTION": 30,
            "cell": 31,
            "FIXEDCELL": 32,
            ":": 33,
            "CELL": 34,
            "SHEET": 35,
            "!": 36,
            "RANGE": 37,
            ";": 38,
            ",": 39,
            "VARIABLE": 40,
            "DECIMAL": 41,
            "NUMBER": 42,
            "%": 43,
            "#": 44,
            "$accept": 0,
            "$end": 1
        },
        terminals_: {
            5: "EOF",
            7: "TRUE",
            8: "FALSE",
            9: "NULL",
            10: "TIME_AMPM",
            11: "TIME_24",
            13: "STRING",
            14: "&",
            15: "=",
            16: "+",
            17: "(",
            18: ")",
            19: "[",
            21: "]",
            22: "<",
            23: ">",
            24: "NOT",
            25: "-",
            26: "*",
            27: "/",
            28: "^",
            29: "E",
            30: "FUNCTION",
            32: "FIXEDCELL",
            33: ":",
            34: "CELL",
            35: "SHEET",
            36: "!",
            37: "RANGE",
            38: ";",
            39: ",",
            40: "VARIABLE",
            41: "DECIMAL",
            42: "NUMBER",
            43: "%",
            44: "#"
        },
        productions_: [0, [3, 2],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 1],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 4],
            [4, 4],
            [4, 4],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 3],
            [4, 2],
            [4, 2],
            [4, 1],
            [4, 3],
            [4, 4],
            [4, 1],
            [4, 1],
            [4, 2],
            [31, 1],
            [31, 3],
            [31, 1],
            [31, 3],
            [31, 3],
            [31, 5],
            [31, 1],
            [31, 3],
            [20, 1],
            [20, 3],
            [20, 3],
            [6, 1],
            [6, 3],
            [12, 1],
            [12, 3],
            [12, 2],
            [2, 3],
            [2, 4]
        ],
        performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate, $$, _$) {
            /* this == yyval */

            var $0 = $$.length - 1;
            switch (yystate) {
                case 1:
                    return $$[$0 - 1];
                    break;
                case 2:
                    this.$ = sheet.getVariable($$[$0])

                    break;
                case 3:
                    this.$ = true;

                    break;
                case 4:
                    this.$ = false;

                    break;
                case 5:
                    this.$ = null;

                    break;
                case 6:
                    this.$ = sheet.time($$[$0]);

                    break;
                case 7:
                    this.$ = sheet.time($$[$0]);

                    break;
                case 8:
                    this.$ = $$[$0] * 1;

                    if (isNaN(this.$)) this.$ = 0;

                    break;
                case 9:
                    this.$ = $$[$0].substring(1, $$[$0].length - 1);

                    break;
                case 10:
                    this.$ = '' + $$[$0 - 2] + $$[$0];

                    break;
                case 11:
                    this.$ = sheet.comparator.equal.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 12:
                    this.$ = formula.math.SUM.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 13:
                    this.$ = $$[$0 - 1] * 1;
                    break;
                case 14:
                    this.$ = $$[$0 - 1];

                    break;
                case 15:
                    this.$ = sheet.comparator.lessEqual.call(sheet, $$[$0 - 3], $$[$0]);

                    break;
                case 16:
                    this.$ = sheet.comparator.greaterEqual.call(sheet, $$[$0 - 3], $$[$0]);

                    break;
                case 17:
                    this.$ = sheet.comparator.notEqual.call(sheet, $$[$0 - 3], $$[$0]);

                    break;
                case 18:
                    this.$ = $$[$0 - 2] != $$[$0];

                    break;
                case 19:
                    this.$ = sheet.comparator.greater.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 20:
                    this.$ = sheet.comparator.less.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 21:
                    this.$ = formula.math.SUBTRACT.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 22:
                    this.$ = formula.math.MULTIPLY.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 23:
                    this.$ = formula.math.DIVIDE.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 24:
                    this.$ = formula.math.POWER.call(sheet, $$[$0 - 2], $$[$0]);

                    break;
                case 25:
                    this.$ = $$[$0] * -1;
                    if (isNaN(this.$)) this.$ = 0;

                    break;
                case 26:
                    this.$ = $$[$0] * 1;
                    if (isNaN(this.$)) this.$ = 0;

                    break;
                case 27:
                    this.$ = Math.E;

                    break;
                case 28:
                    this.$ = sheet.callFunction($$[$0 - 2]);

                    break;
                case 29:
                    this.$ = sheet.callFunction($$[$0 - 3], $$[$0 - 1]);

                    break;
                case 33:
                    this.$ = sheet.getCellValue($$[$0]);

                    break;
                case 34:
                    this.$ = sheet.getCellRangeValue($$[$0 - 2], $$[$0]);

                    break;
                case 35:
                    this.$ = sheet.getCellValue($$[$0]);

                    break;
                case 36:
                    this.$ = sheet.getCellRangeValue($$[$0 - 2], $$[$0]);

                    break;
                case 37:
                    this.$ = sheet.getRemoteCellValue($$[$0 - 2], $$[$0]);

                    break;
                case 38:
                    this.$ = sheet.getRemoteCellRangeValue($$[$0 - 4], $$[$0 - 2], $$[$0]);

                    break;
                case 39:
                    this.$ = sheet.getColumnRange($$[$0])

                    break;
                case 40:
                    this.$ = sheet.getRemoteColumnRange($$[$0 - 2], $$[$0]);

                    break;
                case 41:
                    this.$ = [$$[$0]];

                    break;
                case 42:
                    $$[$0 - 2].push($$[$0]);
                    this.$ = $$[$0 - 2];


                    break;
                case 43:
                    $$[$0 - 2].push($$[$0]);
                    this.$ = $$[$0 - 2];


                    break;
                case 44:
                    this.$ = [$$[$0]];

                    break;
                case 45:
                    this.$ = ($.isArray($$[$0 - 2]) ? $$[$0 - 2] : [$$[$0 - 2]]);
                    this.$.push($$[$0]);


                    break;
                case 46:
                    this.$ = $$[$0] * 1;

                    break;
                case 47:
                    this.$ = ($$[$0 - 2] + '.' + $$[$0]) * 1;

                    break;
                case 48:
                    this.$ = $$[$0 - 1] * 0.01;

                    break;
                case 49:
                    this.$ = $$[$0 - 2] + $$[$0 - 1] + $$[$0];

                    break;
                case 50:
                    this.$ = $$[$0 - 2] + $$[$0 - 1] + $$[$0];

                    break;
            }
        },
        table: [{
            2: 18,
            3: 1,
            4: 2,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            1: [3]
        }, {
            5: [1, 26],
            14: [1, 27],
            15: [1, 28],
            16: [1, 29],
            22: [1, 30],
            23: [1, 31],
            24: [1, 32],
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            26: [1, 34],
            27: [1, 35],
            28: [1, 36]
        }, {
            5: [2, 2],
            14: [2, 2],
            15: [2, 2],
            16: [2, 2],
            18: [2, 2],
            21: [2, 2],
            22: [2, 2],
            23: [2, 2],
            24: [2, 2],
            25: [2, 2],
            26: [2, 2],
            27: [2, 2],
            28: [2, 2],
            38: [2, 2],
            39: [2, 2],
            41: [1, 37]
        }, {
            5: [2, 3],
            14: [2, 3],
            15: [2, 3],
            16: [2, 3],
            18: [2, 3],
            21: [2, 3],
            22: [2, 3],
            23: [2, 3],
            24: [2, 3],
            25: [2, 3],
            26: [2, 3],
            27: [2, 3],
            28: [2, 3],
            38: [2, 3],
            39: [2, 3]
        }, {
            5: [2, 4],
            14: [2, 4],
            15: [2, 4],
            16: [2, 4],
            18: [2, 4],
            21: [2, 4],
            22: [2, 4],
            23: [2, 4],
            24: [2, 4],
            25: [2, 4],
            26: [2, 4],
            27: [2, 4],
            28: [2, 4],
            38: [2, 4],
            39: [2, 4]
        }, {
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            16: [2, 5],
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            26: [2, 5],
            27: [2, 5],
            28: [2, 5],
            38: [2, 5],
            39: [2, 5]
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            14: [2, 6],
            15: [2, 6],
            16: [2, 6],
            18: [2, 6],
            21: [2, 6],
            22: [2, 6],
            23: [2, 6],
            24: [2, 6],
            25: [2, 6],
            26: [2, 6],
            27: [2, 6],
            28: [2, 6],
            38: [2, 6],
            39: [2, 6]
        }, {
            5: [2, 7],
            14: [2, 7],
            15: [2, 7],
            16: [2, 7],
            18: [2, 7],
            21: [2, 7],
            22: [2, 7],
            23: [2, 7],
            24: [2, 7],
            25: [2, 7],
            26: [2, 7],
            27: [2, 7],
            28: [2, 7],
            38: [2, 7],
            39: [2, 7]
        }, {
            5: [2, 8],
            14: [2, 8],
            15: [2, 8],
            16: [2, 8],
            18: [2, 8],
            21: [2, 8],
            22: [2, 8],
            23: [2, 8],
            24: [2, 8],
            25: [2, 8],
            26: [2, 8],
            27: [2, 8],
            28: [2, 8],
            38: [2, 8],
            39: [2, 8],
            43: [1, 38]
        }, {
            5: [2, 9],
            14: [2, 9],
            15: [2, 9],
            16: [2, 9],
            18: [2, 9],
            21: [2, 9],
            22: [2, 9],
            23: [2, 9],
            24: [2, 9],
            25: [2, 9],
            26: [2, 9],
            27: [2, 9],
            28: [2, 9],
            38: [2, 9],
            39: [2, 9]
        }, {
            2: 18,
            4: 39,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            2: 18,
            4: 41,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            20: 40,
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            2: 18,
            4: 42,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            2: 18,
            4: 43,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            5: [2, 27],
            14: [2, 27],
            15: [2, 27],
            16: [2, 27],
            18: [2, 27],
            21: [2, 27],
            22: [2, 27],
            23: [2, 27],
            24: [2, 27],
            25: [2, 27],
            26: [2, 27],
            27: [2, 27],
            28: [2, 27],
            38: [2, 27],
            39: [2, 27]
        }, {
            17: [1, 44]
        }, {
            5: [2, 30],
            14: [2, 30],
            15: [2, 30],
            16: [2, 30],
            18: [2, 30],
            21: [2, 30],
            22: [2, 30],
            23: [2, 30],
            24: [2, 30],
            25: [2, 30],
            26: [2, 30],
            27: [2, 30],
            28: [2, 30],
            38: [2, 30],
            39: [2, 30]
        }, {
            2: 45,
            5: [2, 31],
            14: [2, 31],
            15: [2, 31],
            16: [2, 31],
            18: [2, 31],
            21: [2, 31],
            22: [2, 31],
            23: [2, 31],
            24: [2, 31],
            25: [2, 31],
            26: [2, 31],
            27: [2, 31],
            28: [2, 31],
            38: [2, 31],
            39: [2, 31],
            40: [1, 46],
            44: [1, 25]
        }, {
            5: [2, 44],
            14: [2, 44],
            15: [2, 44],
            16: [2, 44],
            18: [2, 44],
            21: [2, 44],
            22: [2, 44],
            23: [2, 44],
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            38: [2, 44],
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            25: [2, 46],
            26: [2, 46],
            27: [2, 46],
            28: [2, 46],
            38: [2, 46],
            39: [2, 46],
            41: [1, 48],
            43: [2, 46]
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            33: [1, 49],
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            25: [2, 35],
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            33: [1, 50],
            38: [2, 35],
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            25: [2, 39],
            26: [2, 39],
            27: [2, 39],
            28: [2, 39],
            38: [2, 39],
            39: [2, 39]
        }, {
            40: [1, 52]
        }, {
            1: [2, 1]
        }, {
            2: 18,
            4: 53,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
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            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
            37: [1, 24],
            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
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            2: 18,
            4: 54,
            6: 3,
            7: [1, 4],
            8: [1, 5],
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            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
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            32: [1, 21],
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            40: [1, 19],
            42: [1, 20],
            44: [1, 25]
        }, {
            2: 18,
            4: 55,
            6: 3,
            7: [1, 4],
            8: [1, 5],
            9: [1, 6],
            10: [1, 7],
            11: [1, 8],
            12: 9,
            13: [1, 10],
            16: [1, 14],
            17: [1, 11],
            19: [1, 12],
            25: [1, 13],
            29: [1, 15],
            30: [1, 16],
            31: 17,
            32: [1, 21],
            34: [1, 22],
            35: [1, 23],
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            23: [2, 29],
            24: [2, 29],
            25: [2, 29],
            26: [2, 29],
            27: [2, 29],
            28: [2, 29],
            38: [2, 29],
            39: [2, 29]
        }, {
            5: [2, 50],
            14: [2, 50],
            15: [2, 50],
            16: [2, 50],
            18: [2, 50],
            21: [2, 50],
            22: [2, 50],
            23: [2, 50],
            24: [2, 50],
            25: [2, 50],
            26: [2, 50],
            27: [2, 50],
            28: [2, 50],
            38: [2, 50],
            39: [2, 50],
            40: [2, 50],
            44: [2, 50]
        }, {
            34: [1, 88]
        }, {
            5: [2, 38],
            14: [2, 38],
            15: [2, 38],
            16: [2, 38],
            18: [2, 38],
            21: [2, 38],
            22: [2, 38],
            23: [2, 38],
            24: [2, 38],
            25: [2, 38],
            26: [2, 38],
            27: [2, 38],
            28: [2, 38],
            38: [2, 38],
            39: [2, 38]
        }],
        defaultActions: {
            26: [2, 1]
        },
        parseError: function parseError(str, hash) {
            if (hash.recoverable) {
                this.trace(str)
            } else {
                throw new Error(str)
            }
        },
        parse: function parse(input) {
            var self = this,
                stack = [0],
                vstack = [null],
                lstack = [],
                table = this.table,
                yytext = "",
                yylineno = 0,
                yyleng = 0,
                recovering = 0,
                TERROR = 2,
                EOF = 1;
            var args = lstack.slice.call(arguments, 1);
            this.lexer.setInput(input);
            this.lexer.yy = this.yy;
            this.yy.lexer = this.lexer;
            this.yy.parser = this;
            if (typeof this.lexer.yylloc == "undefined") {
                this.lexer.yylloc = {}
            }
            var yyloc = this.lexer.yylloc;
            lstack.push(yyloc);
            var ranges = this.lexer.options && this.lexer.options.ranges;
            if (typeof this.yy.parseError === "function") {
                this.parseError = this.yy.parseError
            } else {
                this.parseError = Object.getPrototypeOf(this).parseError
            }

            function popStack(n) {
                stack.length = stack.length - 2 * n;
                vstack.length = vstack.length - n;
                lstack.length = lstack.length - n
            }

            function lex() {
                var token;
                token = self.lexer.lex() || EOF;
                if (typeof token !== "number") {
                    token = self.symbols_[token] || token
                }
                return token
            }
            var symbol, preErrorSymbol, state, action, a, r, yyval = {},
                p, len, newState, expected;
            while (true) {
                state = stack[stack.length - 1];
                if (this.defaultActions[state]) {
                    action = this.defaultActions[state]
                } else {
                    if (symbol === null || typeof symbol == "undefined") {
                        symbol = lex()
                    }
                    action = table[state] && table[state][symbol]
                }
                _handle_error: if (typeof action === "undefined" || !action.length || !action[0]) {
                    var error_rule_depth;
                    var errStr = "";

                    function locateNearestErrorRecoveryRule(state) {
                        var stack_probe = stack.length - 1;
                        var depth = 0;
                        for (;;) {
                            if (TERROR.toString() in table[state]) {
                                return depth
                            }
                            if (state === 0 || stack_probe < 2) {
                                return false
                            }
                            stack_probe -= 2;
                            state = stack[stack_probe];
                            ++depth
                        }
                    }
                    if (!recovering) {
                        error_rule_depth = locateNearestErrorRecoveryRule(state);
                        expected = [];
                        for (p in table[state]) {
                            if (this.terminals_[p] && p > TERROR) {
                                expected.push("'" + this.terminals_[p] + "'")
                            }
                        }
                        if (this.lexer.showPosition) {
                            errStr = "Parse error on line " + (yylineno + 1) + ":\n" + this.lexer.showPosition() + "\nExpecting " + expected.join(", ") + ", got '" + (this.terminals_[symbol] || symbol) + "'"
                        } else {
                            errStr = "Parse error on line " + (yylineno + 1) + ": Unexpected " + (symbol == EOF ? "end of input" : "'" + (this.terminals_[symbol] || symbol) + "'")
                        }
                        this.parseError(errStr, {
                            text: this.lexer.match,
                            token: this.terminals_[symbol] || symbol,
                            line: this.lexer.yylineno,
                            loc: yyloc,
                            expected: expected,
                            recoverable: error_rule_depth !== false
                        })
                    } else if (preErrorSymbol !== EOF) {
                        error_rule_depth = locateNearestErrorRecoveryRule(state)
                    }
                    if (recovering == 3) {
                        if (symbol === EOF || preErrorSymbol === EOF) {
                            throw new Error(errStr || "Parsing halted while starting to recover from another error.")
                        }
                        yyleng = this.lexer.yyleng;
                        yytext = this.lexer.yytext;
                        yylineno = this.lexer.yylineno;
                        yyloc = this.lexer.yylloc;
                        symbol = lex()
                    }
                    if (error_rule_depth === false) {
                        throw new Error(errStr || "Parsing halted. No suitable error recovery rule available.")
                    }
                    popStack(error_rule_depth);
                    preErrorSymbol = symbol == TERROR ? null : symbol;
                    symbol = TERROR;
                    state = stack[stack.length - 1];
                    action = table[state] && table[state][TERROR];
                    recovering = 3
                }
                if (action[0] instanceof Array && action.length > 1) {
                    throw new Error("Parse Error: multiple actions possible at state: " + state + ", token: " + symbol)
                }
                switch (action[0]) {
                    case 1:
                        stack.push(symbol);
                        vstack.push(this.lexer.yytext);
                        lstack.push(this.lexer.yylloc);
                        stack.push(action[1]);
                        symbol = null;
                        if (!preErrorSymbol) {
                            yyleng = this.lexer.yyleng;
                            yytext = this.lexer.yytext;
                            yylineno = this.lexer.yylineno;
                            yyloc = this.lexer.yylloc;
                            if (recovering > 0) {
                                recovering--
                            }
                        } else {
                            symbol = preErrorSymbol;
                            preErrorSymbol = null
                        }
                        break;
                    case 2:
                        len = this.productions_[action[1]][1];
                        yyval.$ = vstack[vstack.length - len];
                        yyval._$ = {
                            first_line: lstack[lstack.length - (len || 1)].first_line,
                            last_line: lstack[lstack.length - 1].last_line,
                            first_column: lstack[lstack.length - (len || 1)].first_column,
                            last_column: lstack[lstack.length - 1].last_column
                        };
                        if (ranges) {
                            yyval._$.range = [lstack[lstack.length - (len || 1)].range[0], lstack[lstack.length - 1].range[1]]
                        }
                        r = this.performAction.apply(yyval, [yytext, yyleng, yylineno, this.yy, action[1], vstack, lstack].concat(args));
                        if (typeof r !== "undefined") {
                            return r
                        }
                        if (len) {
                            stack = stack.slice(0, -1 * len * 2);
                            vstack = vstack.slice(0, -1 * len);
                            lstack = lstack.slice(0, -1 * len)
                        }
                        stack.push(this.productions_[action[1]][0]);
                        vstack.push(yyval.$);
                        lstack.push(yyval._$);
                        newState = table[stack[stack.length - 2]][stack[stack.length - 1]];
                        stack.push(newState);
                        break;
                    case 3:
                        return true
                }
            }
            return true
        }
    };
    /* generated by jison-lex 0.2.1 */
    var lexer = (function() {
        var lexer = {

            EOF: 1,

            parseError: function parseError(str, hash) {
                "use strict";
                if (this.yy.parser) {
                    this.yy.parser.parseError(str, hash)
                } else {
                    throw new Error(str)
                }
            },

            // resets the lexer, sets new input
            setInput: function(input) {
                "use strict";
                this._input = input;
                this._more = this._backtrack = this.done = false;
                this.yylineno = this.yyleng = 0;
                this.yytext = this.matched = this.match = "";
                this.conditionStack = ["INITIAL"];
                this.yylloc = {
                    first_line: 1,
                    first_column: 0,
                    last_line: 1,
                    last_column: 0
                };
                if (this.options.ranges) {
                    this.yylloc.range = [0, 0]
                }
                this.offset = 0;
                return this
            },

            // consumes and returns one char from the input
            input: function() {
                "use strict";
                var ch = this._input[0];
                this.yytext += ch;
                this.yyleng++;
                this.offset++;
                this.match += ch;
                this.matched += ch;
                var lines = ch.match(/(?:\r\n?|\n).*/g);
                if (lines) {
                    this.yylineno++;
                    this.yylloc.last_line++
                } else {
                    this.yylloc.last_column++
                }
                if (this.options.ranges) {
                    this.yylloc.range[1]++
                }
                this._input = this._input.slice(1);
                return ch
            },

            // unshifts one char (or a string) into the input
            unput: function(ch) {
                "use strict";
                var len = ch.length;
                var lines = ch.split(/(?:\r\n?|\n)/g);
                this._input = ch + this._input;
                this.yytext = this.yytext.substr(0, this.yytext.length - len - 1);
                this.offset -= len;
                var oldLines = this.match.split(/(?:\r\n?|\n)/g);
                this.match = this.match.substr(0, this.match.length - 1);
                this.matched = this.matched.substr(0, this.matched.length - 1);
                if (lines.length - 1) {
                    this.yylineno -= lines.length - 1
                }
                var r = this.yylloc.range;
                this.yylloc = {
                    first_line: this.yylloc.first_line,
                    last_line: this.yylineno + 1,
                    first_column: this.yylloc.first_column,
                    last_column: lines ? (lines.length === oldLines.length ? this.yylloc.first_column : 0) + oldLines[oldLines.length - lines.length].length - lines[0].length : this.yylloc.first_column - len
                };
                if (this.options.ranges) {
                    this.yylloc.range = [r[0], r[0] + this.yyleng - len]
                }
                this.yyleng = this.yytext.length;
                return this
            },

            // When called from action, caches matched text and appends it on next action
            more: function() {
                "use strict";
                this._more = true;
                return this
            },

            // When called from action, signals the lexer that this rule fails to match the input, so the next matching rule (regex) should be tested instead.
            reject: function() {
                "use strict";
                if (this.options.backtrack_lexer) {
                    this._backtrack = true
                } else {
                    return this.parseError("Lexical error on line " + (this.yylineno + 1) + ". You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n" + this.showPosition(), {
                        text: "",
                        token: null,
                        line: this.yylineno
                    })
                }
                return this
            },

            // retain first n characters of the match
            less: function(n) {
                "use strict";
                this.unput(this.match.slice(n))
            },

            // displays already matched input, i.e. for error messages
            pastInput: function() {
                "use strict";
                var past = this.matched.substr(0, this.matched.length - this.match.length);
                return (past.length > 20 ? "..." : "") + past.substr(-20).replace(/\n/g, "")
            },

            // displays upcoming input, i.e. for error messages
            upcomingInput: function() {
                "use strict";
                var next = this.match;
                if (next.length < 20) {
                    next += this._input.substr(0, 20 - next.length)
                }
                return (next.substr(0, 20) + (next.length > 20 ? "..." : "")).replace(/\n/g, "")
            },

            // displays the character position where the lexing error occurred, i.e. for error messages
            showPosition: function() {
                "use strict";
                var pre = this.pastInput();
                var c = new Array(pre.length + 1).join("-");
                return pre + this.upcomingInput() + "\n" + c + "^"
            },

            // test the lexed token: return FALSE when not a match, otherwise return token
            test_match: function(match, indexed_rule) {
                "use strict";
                var token, lines, backup;
                if (this.options.backtrack_lexer) {
                    backup = {
                        yylineno: this.yylineno,
                        yylloc: {
                            first_line: this.yylloc.first_line,
                            last_line: this.last_line,
                            first_column: this.yylloc.first_column,
                            last_column: this.yylloc.last_column
                        },
                        yytext: this.yytext,
                        match: this.match,
                        matches: this.matches,
                        matched: this.matched,
                        yyleng: this.yyleng,
                        offset: this.offset,
                        _more: this._more,
                        _input: this._input,
                        yy: this.yy,
                        conditionStack: this.conditionStack.slice(0),
                        done: this.done
                    };
                    if (this.options.ranges) {
                        backup.yylloc.range = this.yylloc.range.slice(0)
                    }
                }
                lines = match[0].match(/(?:\r\n?|\n).*/g);
                if (lines) {
                    this.yylineno += lines.length
                }
                this.yylloc = {
                    first_line: this.yylloc.last_line,
                    last_line: this.yylineno + 1,
                    first_column: this.yylloc.last_column,
                    last_column: lines ? lines[lines.length - 1].length - lines[lines.length - 1].match(/\r?\n?/)[0].length : this.yylloc.last_column + match[0].length
                };
                this.yytext += match[0];
                this.match += match[0];
                this.matches = match;
                this.yyleng = this.yytext.length;
                if (this.options.ranges) {
                    this.yylloc.range = [this.offset, this.offset += this.yyleng]
                }
                this._more = false;
                this._backtrack = false;
                this._input = this._input.slice(match[0].length);
                this.matched += match[0];
                token = this.performAction.call(this, this.yy, this, indexed_rule, this.conditionStack[this.conditionStack.length - 1]);
                if (this.done && this._input) {
                    this.done = false
                }
                if (token) {
                    return token
                } else if (this._backtrack) {
                    for (var k in backup) {
                        this[k] = backup[k]
                    }
                    return false
                }
                return false
            },

            // return next match in input
            next: function() {
                "use strict";
                if (this.done) {
                    return this.EOF
                }
                if (!this._input) {
                    this.done = true
                }
                var token, match, tempMatch, index;
                if (!this._more) {
                    this.yytext = "";
                    this.match = ""
                }
                var rules = this._currentRules();
                for (var i = 0; i < rules.length; i++) {
                    tempMatch = this._input.match(this.rules[rules[i]]);
                    if (tempMatch && (!match || tempMatch[0].length > match[0].length)) {
                        match = tempMatch;
                        index = i;
                        if (this.options.backtrack_lexer) {
                            token = this.test_match(tempMatch, rules[i]);
                            if (token !== false) {
                                return token
                            } else if (this._backtrack) {
                                match = false;
                                continue
                            } else {
                                return false
                            }
                        } else if (!this.options.flex) {
                            break
                        }
                    }
                }
                if (match) {
                    token = this.test_match(match, rules[index]);
                    if (token !== false) {
                        return token
                    }
                    return false
                }
                if (this._input === "") {
                    return this.EOF
                } else {
                    return this.parseError("Lexical error on line " + (this.yylineno + 1) + ". Unrecognized text.\n" + this.showPosition(), {
                        text: "",
                        token: null,
                        line: this.yylineno
                    })
                }
            },

            // return next match that has a token
            lex: function lex() {
                "use strict";
                var r = this.next();
                if (r) {
                    return r
                } else {
                    return this.lex()
                }
            },

            // activates a new lexer condition state (pushes the new lexer condition state onto the condition stack)
            begin: function begin(condition) {
                "use strict";
                this.conditionStack.push(condition)
            },

            // pop the previously active lexer condition state off the condition stack
            popState: function popState() {
                "use strict";
                var n = this.conditionStack.length - 1;
                if (n > 0) {
                    return this.conditionStack.pop()
                } else {
                    return this.conditionStack[0]
                }
            },

            // produce the lexer rule set which is active for the currently active lexer condition state
            _currentRules: function _currentRules() {
                "use strict";
                if (this.conditionStack.length && this.conditionStack[this.conditionStack.length - 1]) {
                    return this.conditions[this.conditionStack[this.conditionStack.length - 1]].rules
                } else {
                    return this.conditions["INITIAL"].rules
                }
            },

            // return the currently active lexer condition state; when an index argument is provided it produces the N-th previous condition state, if available
            topState: function topState(n) {
                "use strict";
                n = this.conditionStack.length - 1 - Math.abs(n || 0);
                if (n >= 0) {
                    return this.conditionStack[n]
                } else {
                    return "INITIAL"
                }
            },

            // alias for begin(condition)
            pushState: function pushState(condition) {
                "use strict";
                this.begin(condition)
            },

            // return the number of states currently on the stack
            stateStackSize: function stateStackSize() {
                "use strict";
                return this.conditionStack.length
            },
            options: {},
            performAction: function anonymous(yy, yy_, $avoiding_name_collisions, YY_START) {

                var YYSTATE = YY_START;
                switch ($avoiding_name_collisions) {
                    case 0:
                        /* skip whitespace */
                        break;
                    case 1:
                        return 13;
                        break;
                    case 2:
                        return 13;
                        break;
                    case 3:
                        return 35;
                        break;
                    case 4:
                        return 30;
                        break;
                    case 5:
                        return 10;
                        break;
                    case 6:
                        return 11;
                        break;
                    case 7:
                        if (sheet.obj.type == 'cell') return 32;
                        return 40;


                        break;
                    case 8:
                        if (sheet.obj.type == 'cell') return 34;
                        return 40;


                        break;
                    case 9:
                        return 37;


                        break;
                    case 10:
                        return 30;
                        break;
                    case 11:
                        return 40;
                        break;
                    case 12:
                        return 40;
                        break;
                    case 13:
                        return 42;
                        break;
                    case 14:
                        /* skip whitespace */
                        break;
                    case 15:
                        return ' ';
                        break;
                    case 16:
                        return 41;
                        break;
                    case 17:
                        return 33;
                        break;
                    case 18:
                        return 38;
                        break;
                    case 19:
                        return 39;
                        break;
                    case 20:
                        return 26;
                        break;
                    case 21:
                        return 27;
                        break;
                    case 22:
                        return 25;
                        break;
                    case 23:
                        return 16;
                        break;
                    case 24:
                        return 28;
                        break;
                    case 25:
                        return 17;
                        break;
                    case 26:
                        return 18;
                        break;
                    case 27:
                        return 19;
                        break;
                    case 28:
                        return 21;
                        break;
                    case 29:
                        return 23;
                        break;
                    case 30:
                        return 22;
                        break;
                    case 31:
                        return 24;
                        break;
                    case 32:
                        return 'PI';
                        break;
                    case 33:
                        return 29;
                        break;
                    case 34:
                        return 7;
                        break;
                    case 35:
                        return 8;
                        break;
                    case 36:
                        return 9;
                        break;
                    case 37:
                        return '"';
                        break;
                    case 38:
                        return "'";
                        break;
                    case 39:
                        return "!";
                        break;
                    case 40:
                        return 15;
                        break;
                    case 41:
                        return 43;
                        break;
                    case 42:
                        return 44;
                        break;
                    case 43:
                        return 14;
                        break;
                    case 44:
                        return 5;
                        break;
                }
            },
            rules: [
                /^(?:\s+)/,
                /^(?:"(\\["]|[^"])*")/,
                /^(?:'(\\[']|[^'])*')/,
                /^(?:#[A-Za-z0-9_]+)/,
                /^(?:[A-Za-z]{1,}[A-Za-z_0-9]+(?=[(]))/,
                /^(?:([0]?[1-9]|1[0-2])[:][0-5][0-9]([:][0-5][0-9])?[ ]?(AM|am|aM|Am|PM|pm|pM|Pm))/,
                /^(?:([0]?[0-9]|1[0-9]|2[0-3])[:][0-5][0-9]([:][0-5][0-9])?)/,
                /^(?:\$[A-Za-z]+\$[0-9]+)/,
                /^(?:[A-Za-z]+[0-9]+)/,
                /^(?:[A-Za-z]+[:][A-Za-z]+)/,
                /^(?:[A-Za-z]+(?=[(]))/,
                /^(?:[A-Za-z]{1,}[A-Za-z_0-9]+)/,
                /^(?:[A-Za-z_]+)/,
                /^(?:[0-9]+)/,
                /^(?:\$)/,
                /^(?: )/,
                /^(?:[.])/,
                /^(?::)/,
                /^(?:;)/,
                /^(?:,)/,
                /^(?:\*)/,
                /^(?:\/)/,
                /^(?:-)/,
                /^(?:\+)/,
                /^(?:\^)/,
                /^(?:\()/,
                /^(?:\))/,
                /^(?:\[)/,
                /^(?:\])/,
                /^(?:>)/,
                /^(?:<)/,
                /^(?:NOT\b)/,
                /^(?:PI\b)/,
                /^(?:E\b)/,
                /^(?:TRUE\b)/,
                /^(?:FALSE\b)/,
                /^(?:NULL\b)/,
                /^(?:")/,
                /^(?:')/,
                /^(?:!)/,
                /^(?:=)/,
                /^(?:%)/,
                /^(?:[#])/,
                /^(?:[&])/,
                /^(?:$)/
            ],
            conditions: {
                "INITIAL": {
                    "rules": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44],
                    "inclusive": true
                }
            }
        };
        return lexer;
    })();
    parser.lexer = lexer;

    function Parser() {
        this.yy = {};
    }
    Parser.prototype = parser;
    parser.Parser = Parser;
    return new Parser;
}var formula = {
    custom : {

},
    /**
 * date formula group.
 * adapted from stoic's formula.js (http://www.stoic.com/pages/formula)
 * with modification to adapt Calx environment
 * @type {Object}
 */
date: {
    DATE : function(year, month, day) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }
        if(typeof(month) == 'undefined'){
            return moment(year);
        }

        return new Date(year, month - 1, day);
    },

    DATEDIFF : function (start_date, end_date, period) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(end_date).diff(moment.utc(start_date), period);
    },

    DATEFORMAT : function(date, format){
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(date).format(format);
    },

    DATEVALUE : function(date_text) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return Math.ceil((moment(date_text) - moment('1900-1-1')) / 86400000) + 2;
    },

    DAY : function(date) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(date)).date();
    },

    DAYNAME : function(date){
        return data.DAY_NAME[formula.date.WEEKDAY(date)-1];
    },

    DAYS : function(end_date, start_date) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(end_date)).diff(moment(new Date(start_date)), 'days');
    },

    DAYS360 : function(start_date, end_date, method) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var start = moment(new Date(start_date));
        var end = moment(new Date(end_date));
        var smd = 31;
        var emd = 31;
        var sd = start.date();
        var ed = end.date();
        if (method) {
            sd = (sd === 31) ? 30 : sd;
            ed = (ed === 31) ? 30 : ed;
        } else {
            if (start.month() === 1) {
                smd = start.daysInMonth();
            }
            if (end.month() === 1) {
                emd = end.daysInMonth();
            }
            sd = (sd === smd) ? 30 : sd;
            if (sd === 30 || sd === smd) {
                ed = (ed === emd) ? 30 : ed;
            }
        }
        return 360 * (end.year() - start.year()) + 30 * (end.month() - start.month()) + (ed - sd);
    },

    EDATE : function(start_date, months) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(start_date)).add('months', months).toDate();
    },

    EOMONTH : function(start_date, months) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var edate = moment(new Date(start_date)).add('months', months);
        return new Date(edate.year(), edate.month(), edate.daysInMonth());
    },

    FROMNOW : function(timestamp, nosuffix) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(timestamp)).fromNow(nosuffix);
    },

    HOUR : function(timestamp) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return (timestamp <= 1) ? Math.floor(24 * timestamp) : moment(new Date(timestamp)).hours();
    },

    MINUTE : function(timestamp) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return (timestamp <= 1) ? Math.floor(24 * 60 * timestamp) - 60 * Math.floor(24 * timestamp) : moment(new Date(timestamp)).minutes();
    },

    ISOWEEKNUM : function(date) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(date)).format('w');
    },

    MONTH : function(timestamp) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(timestamp)).month() + 1;
    },

    NETWORKDAYS : function(start_date, end_date, holidays) {
        return formula.date.NETWORKDAYSINTL(start_date, end_date, 1, holidays);
    },

    NETWORKDAYSINTL : function(start_date, end_date, weekend, holidays) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var weekend_type = (typeof weekend === 'undefined') ? 1 : weekend;
        var weekend_days = data.WEEKEND_TYPES[weekend_type];
        var sd = moment(start_date);
        var ed = moment(end_date);
        var net_days = ed.diff(sd, 'days') + 1;
        var net_work_days = net_days;
        var day_of_week = '';
        var cd = sd;
        var holiday_dates = [];
        if (typeof holidays !== 'undefined') {
            for (var i = 0; i < holidays.length; i++) {
                holiday_dates[i] = moment(new Date(holidays[i])).format('MM-DD-YYYY');
            }
        }
        var j = 0;
        while (j < net_days) {
            day_of_week = cd.format('d');
            if (weekend_days.indexOf(parseInt(day_of_week, 10)) >= 0) {
                net_work_days--;
            } else if (holiday_dates.indexOf(cd.format('MM-DD-YYYY')) >= 0) {
                net_work_days--;
            }
            cd = cd.add('days', 1);
            j++;
        }
        return net_work_days;
    },

    NOW : function() {
        return new Date();
    },

    SECOND : function(timestamp) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(timestamp)).seconds();
    },

    TIME : function(hour, minute, second) {
        return (3600 * hour + 60 * minute + second) / 86400;
    },

    TIMEVALUE : function(time_text) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var timestamp = moment(new Date(time_text));
        return (3600 * timestamp.hours() + 60 * timestamp.minutes() + timestamp.seconds()) / 86400;
    },

    TODAY : function() {
        return new Date();
    },

    WEEKDAY : function(date, type) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var week_day = moment(new Date(date)).format('d');
        var week_type = (typeof type === 'undefined') ? 1 : type;
        return data.WEEK_TYPES[week_type][week_day];
    },

    WEEKNUM : function(date, type) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var current_date = moment(new Date(date));
        var january_first = moment(new Date(current_date.year(), 0, 1));
        var week_type = (typeof type === 'undefined') ? 1 : type;
        var week_start = data.WEEK_STARTS[week_type];
        var first_day = january_first.format('d');
        var offset = (first_day < week_start) ? week_start - first_day + 1 : first_day - week_start;
        if (week_type === 21) {
            return formula.date.ISOWEEKNUM(date);
        } else {
            return Math.floor(current_date.diff(january_first.subtract('days', offset), 'days') / 7) + 1;
        }
    },

    WORKDAY : function(start_date, days, holidays) {
        return formula.date.WORKDAYINTL(start_date, days, 1, holidays);
    },

    WORKDAYINTL : function(start_date, days, weekend, holidays) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        var weekend_type = (typeof weekend === 'undefined') ? 1 : weekend;
        var weekend_days = data.WEEKEND_TYPES[weekend_type];
        var sd = moment(new Date(start_date));
        var cd = sd;
        var day_of_week = '';
        var holiday_dates = [];
        if (typeof holidays !== 'undefined') {
            for (var i = 0; i < holidays.length; i++) {
                holiday_dates[i] = moment(new Date(holidays[i])).format('MM-DD-YYYY');
            }
        }
        var j = 0;
        while (j < days) {
            cd = cd.add('days', 1);
            day_of_week = cd.format('d');
            if (weekend_days.indexOf(parseInt(day_of_week, 10)) < 0 && holiday_dates.indexOf(cd.format('MM-DD-YYYY')) < 0) {
                j++;
            }
        }
        return cd.toDate();
    },

    YEAR : function(date) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        return moment(new Date(date)).year();
    },

    YEARFRAC : function(start_date, end_date, basis) {
        if(typeof (moment) == 'undefined'){
            return data.ERRKEY.momentRequired;
        }

        // Credits: David A. Wheeler [http://www.dwheeler.com/]

        // Initialize parameters
        basis = (typeof basis === 'undefined') ? 0 : basis;
        var sdate = moment(new Date(start_date));
        var edate = moment(new Date(end_date));

        // Return error if either date is invalid
        if (!sdate.isValid() || !edate.isValid()) {
            return '#VALUE!';
        }

        // Return error if basis is neither 0, 1, 2, 3, or 4
        if ([0, 1, 2, 3, 4].indexOf(basis) === -1) {
            return '#NUM!';
        }

        // Return zero if start_date and end_date are the same
        if (sdate === edate) {
            return 0;
        }

        // Swap dates if start_date is later than end_date
        if (sdate.diff(edate) > 0) {
            edate = moment(new Date(start_date));
            sdate = moment(new Date(end_date));
        }

        // Lookup years, months, and days
        var syear = sdate.year();
        var smonth = sdate.month();
        var sday = sdate.date();
        var eyear = edate.year();
        var emonth = edate.month();
        var eday = edate.date();

        switch (basis) {
            case 0:
                // US (NASD) 30/360
                // Note: if eday == 31, it stays 31 if sday < 30
                if (sday === 31 && eday === 31) {
                    sday = 30;
                    eday = 30;
                } else if (sday === 31) {
                    sday = 30;
                } else if (sday === 30 && eday === 31) {
                    eday = 30;
                } else if (smonth === 1 && emonth === 1 && sdate.daysInMonth() === sday && edate.daysInMonth() === eday) {
                    sday = 30;
                    eday = 30;
                } else if (smonth === 1 && sdate.daysInMonth() === sday) {
                    sday = 30;
                }
                return ((eday + emonth * 30 + eyear * 360) - (sday + smonth * 30 + syear * 360)) / 360;

            case 1:
                // Actual/actual
                var feb29Between = function(date1, date2) {
                    // Requires year2 == (year1 + 1) or year2 == year1
                    // Returns TRUE if February 29 is between the two dates (date1 may be February 29), with two possibilities:
                    // year1 is a leap year and date1 <= Februay 29 of year1
                    // year2 is a leap year and date2 > Februay 29 of year2

                    var mar1year1 = moment(new Date(date1.year(), 2, 1));
                    if (moment([date1.year()]).isLeapYear() && date1.diff(mar1year1) < 0 && date2.diff(mar1year1) >= 0) {
                        return true;
                    }
                    var mar1year2 = moment(new Date(date2.year(), 2, 1));
                    if (moment([date2.year()]).isLeapYear() && date2.diff(mar1year2) >= 0 && date1.diff(mar1year2) < 0) {
                        return true;
                    }
                    return false;
                };
                var ylength = 365;
                if (syear === eyear || ((syear + 1) === eyear) && ((smonth > emonth) || ((smonth === emonth) && (sday >= eday)))) {
                    if (syear === eyear && moment([syear]).isLeapYear()) {
                        ylength = 366;
                    } else if (feb29Between(sdate, edate) || (emonth === 1 && eday === 29)) {
                        ylength = 366;
                    }
                    return edate.diff(sdate, 'days') / ylength;
                } else {
                    var years = (eyear - syear) + 1;
                    var days = moment(new Date(eyear + 1, 0, 1)).diff(moment(new Date(syear, 0, 1)), 'days');
                    var average = days / years;
                    return edate.diff(sdate, 'days') / average;
                }
                break;

            case 2:
                // Actual/360
                return edate.diff(sdate, 'days') / 360;

            case 3:
                // Actual/365
                return edate.diff(sdate, 'days') / 365;

            case 4:
                // European 30/360
                if (sday === 31) {
                    sday = 30;
                }

                if (eday === 31) {
                    eday = 30;
                }
                // Remarkably, do NOT change February 28 or February 29 at ALL
                return ((eday + emonth * 30 + eyear * 360) - (sday + smonth * 30 + syear * 360)) / 360;
        }
    }
},
    math : {
    ABS : function(number) {
        return Math.abs(number);
    },

    ACOS : function(number) {
        return Math.acos(number);
    },

    ACOSH : function(number) {
        return Math.log(number + Math.sqrt(number * number - 1));
    },

    ACOT : function(number) {
        return Math.atan(1 / number);
    },

    ACOTH : function(number) {
        return 0.5 * Math.log((number + 1) / (number - 1));
    },

    AGGREGATE : function(function_code, options) {
        var result = [];
        for (var i = 2; i < arguments.length; i++) {
            switch (function_code) {
                case 1:
                    result[i - 2] = formula.statistic.AVERAGE(arguments[i]);
                    break;
                case 2:
                    result[i - 2] = formula.statistic.COUNT(arguments[i]);
                    break;
                case 3:
                    result[i - 2] = formula.statistic.COUNTA(arguments[i]);
                    break;
                case 4:
                    result[i - 2] = formula.statistic.MAX(arguments[i]);
                    break;
                case 5:
                    result[i - 2] = formula.statistic.MIN(arguments[i]);
                    break;
                case 6:
                    result[i - 2] = formula.statistic.PRODUCT(arguments[i]);
                    break;
                case 7:
                    result[i - 2] = formula.statistic.STDEVS(arguments[i]);
                    break;
                case 8:
                    result[i - 2] = formula.statistic.STDEVP(arguments[i]);
                    break;
                case 9:
                    result[i - 2] = formula.math.SUM(arguments[i]);
                    break;
                case 10:
                    result[i - 2] = formula.statistic.VARS(arguments[i]);
                    break;
                case 11:
                    result[i - 2] = formula.statistic.VARP(arguments[i]);
                    break;
                case 12:
                    result[i - 2] = formula.statistic.MEDIAN(arguments[i]);
                    break;
                case 13:
                    result[i - 2] = formula.statistic.MODESNGL(arguments[i]);
                    break;
                case 14:
                    result[i - 2] = formula.statistic.LARGE(arguments[i]);
                    break;
                case 15:
                    result[i - 2] = formula.statistic.SMALL(arguments[i]);
                    break;
                case 16:
                    result[i - 2] = formula.statistic.PERCENTILEINC(arguments[i]);
                    break;
                case 17:
                    result[i - 2] = formula.statistic.QUARTILEINC(arguments[i]);
                    break;
                case 18:
                    result[i - 2] = formula.statistic.PERCENTILEEXC(arguments[i]);
                    break;
                case 19:
                    result[i - 2] = formula.statistic.QUARTILEEXC(arguments[i]);
                    break;
            }
        }
        return result;
    },

    ARABIC : function(text) {
        // Credits: Rafa? Kukawski
        if (!/^M*(?:D?C{0,3}|C[MD])(?:L?X{0,3}|X[CL])(?:V?I{0,3}|I[XV])$/.test(text)) {
            return '#VALUE!';
        }
        var r = 0;
        text.replace(/[MDLV]|C[MD]?|X[CL]?|I[XV]?/g, function(i) {
            r += {
                M: 1000,
                CM: 900,
                D: 500,
                CD: 400,
                C: 100,
                XC: 90,
                L: 50,
                XL: 40,
                X: 10,
                IX: 9,
                V: 5,
                IV: 4,
                I: 1
            }[i];
        });
        return r;
    },

    ASIN : function(number) {
        return Math.asin(number);
    },

    ASINH : function(number) {
        return Math.log(number + Math.sqrt(number * number + 1));
    },

    ATAN : function(number) {
        return Math.atan(number);
    },

    ATAN2 : function(number_x, number_y) {
        return Math.atan2(number_x, number_y);
    },

    ATANH : function(number) {
        return Math.log((1 + number) / (1 - number)) / 2;
    },

    BASE : function(number, radix, min_length) {
        min_length = (typeof min_length === 'undefined') ? 0 : min_length;
        var result = number.toString(radix);
        return new Array(Math.max(min_length + 1 - result.length, 0)).join('0') + result;
    },

    CEILING : function(number, significance, mode) {
        if (significance === 0) {
            return 0;
        }
        significance = (typeof significance === 'undefined') ? 1 : Math.abs(significance);
        mode = (typeof mode === 'undefined') ? 0 : mode;
        var precision = -Math.floor(Math.log(significance) / Math.log(10));
        if (number >= 0) {
            return formula.math.ROUND(Math.ceil(number / significance) * significance, precision);
        } else {
            if (mode === 0) {
                return -formula.math.ROUND(Math.floor(Math.abs(number) / significance) * significance, precision);
            } else {
                return -formula.math.ROUND(Math.ceil(Math.abs(number) / significance) * significance, precision);
            }
        }
    },

    CEILINGMATH : function(number, significance, mode) {
        return formula.math.CEILING(number, significance, mode);
    },

    CEILINGPRECISE : function(number, significance, mode) {
        return formula.math.CEILING(number, significance, mode);
    },

    COMBIN : function(number, number_chosen) {
        return formula.math.FACT(number) / (formula.math.FACT(number_chosen) * formula.math.FACT(number - number_chosen));
    },

    COMBINA : function(number, number_chosen) {
        return (number === 0 && number_chosen === 0) ? 1 : formula.math.COMBIN(number + number_chosen - 1, number - 1);
    },

    COS : function(number) {
        return Math.cos(number);
    },

    COSH : function(number) {
        return (Math.exp(number) + Math.exp(-number)) / 2;
    },

    COT : function(number) {
        return 1 / Math.tan(number);
    },

    COTH : function(number) {
        var e2 = Math.exp(2 * number);
        return (e2 + 1) / (e2 - 1);
    },

    CSC : function(number) {
        return 1 / Math.sin(number);
    },

    CSCH : function(number) {
        return 2 / (Math.exp(number) - Math.exp(-number));
    },

    DECIMAL : function(number, radix) {
        return parseInt(number, radix);
    },

    DEGREES : function(number) {
        return number * 180 / Math.PI;
    },

    DIVIDE : function(num1, num2){
        if(num1 === '' || num2 === ''){
            return '';
        }

        if(num2 == 0){
            return '#DIV/0';
        }

        return parseFloat(num1)/parseFloat(num2);
    },

    EVEN : function(number) {
        return formula.math.CEILING(number, -2, -1);
    },

    EXP : function(number) {
        return Math.exp(number);
    },

    FACT : function(number) {
        var n = Math.floor(number);
        if (n === 0 || n === 1) {
            return 1;
        } else if (data.MEMOIZED_FACT[n] > 0) {
            return data.MEMOIZED_FACT[n];
        } else {
            data.MEMOIZED_FACT[n] = formula.math.FACT(n - 1) * n;
            return data.MEMOIZED_FACT[n];
        }
    },

    FACTDOUBLE : function(number) {
        var n = Math.floor(number);
        if (n <= 0) {
            return 1;
        } else {
            return n * formula.math.FACTDOUBLE(n - 2);
        }
    },

    FLOOR : function(number, significance, mode) {
        if (significance === 0) {
            return 0;
        }
        significance = (typeof significance === 'undefined') ? 1 : Math.abs(significance);
        mode = (typeof mode === 'undefined') ? 0 : mode;
        var precision = -Math.floor(Math.log(significance) / Math.log(10));
        if (number >= 0) {
            return formula.math.ROUND(Math.floor(number / significance) * significance, precision);
        } else {
            if (mode === 0) {
                return -formula.math.ROUND(Math.ceil(Math.abs(number) / significance) * significance, precision);
            } else {
                return -formula.math.ROUND(Math.floor(Math.abs(number) / significance) * significance, precision);
            }
        }
    },

    FLOORMATH : function(number, significance, mode) {
        return formula.math.FLOOR(number, significance, mode);
    },

    FLOORPRECISE : function(number, significance, mode) {
        return formula.math.FLOOR(number, significance, mode);
    },

    GCD : function() {
        // Credits: Andrew Pociu
        for (var r, a, i = arguments.length - 1, result = arguments[i]; i;) {
            for (a = arguments[--i];
                (r = a % result); a = result, result = r) {
                //empty
            }
        }
        return result;
    },

    INT : function(number) {
        return Math.floor(number);
    },

    ISEVEN : function(number) {
        return (Math.floor(Math.abs(number)) & 1) ? false : true;
    },

    ISOCEILING : function(number, significance, mode) {
        return formula.math.CEILING(number, significance, mode);
    },

    ISODD : function(number) {
        return (Math.floor(Math.abs(number)) & 1) ? true : false;
    },

    LCM : function() {
        // Credits: Jonas Raoni Soares Silva
        var o = utility.toArray(arguments);
        for (var i, j, n, d, r = 1;
            (n = o.pop()) !== undefined;) {
            while (n > 1) {
                if (n % 2) {
                    for (i = 3, j = Math.floor(Math.sqrt(n)); i <= j && n % i; i += 2) {
                        //empty
                    }
                    d = (i <= j) ? i : n;
                } else {
                    d = 2;
                }
                for (n /= d, r *= d, i = o.length; i;
                    (o[--i] % d) === 0 && (o[i] /= d) === 1 && o.splice(i, 1)) {
                    //empty
                }
            }
        }
        return r;
    },

    LN : function(number) {
        return Math.log(number);
    },

    LOG : function(number, base) {
        base = (typeof base === 'undefined') ? 10 : base;
        return Math.log(number) / Math.log(base);
    },

    LOG10 : function(number) {
        return Math.log(number) / Math.log(10);
    },

    //MDETERM :,numeric.det;

    //MINVER,E : numeric.inv;

    //MM,LT : numeric.dot;


    MOD : function(dividend, divisor) {
        var modulus = Math.abs(dividend % divisor);
        return (divisor > 0) ? modulus : -modulus;
    },

    MROUND : function(number, multiple) {
        if (number * multiple < 0) {
            throw new Error('Number and multiple must have the same sign.');
        }

        return Math.round(number / multiple) * multiple;
    },

    MULTINOMIAL : function() {
        var sum = 0;
        var divisor = 1;
        for (var i = 0; i < arguments.length; i++) {
            sum += arguments[i];
            divisor *= formula.math.FACT(arguments[i]);
        }
        return formula.math.FACT(sum) / divisor;
    },

    MULTIPLY : function(num1, num2){
        if(num1 === '' || num2 === ''){
            return '';
        }

        num1 = isNaN(parseFloat(num1)) ? 0 : parseFloat(num1);
        num2 = isNaN(parseFloat(num2)) ? 0 : parseFloat(num2);

        return num1*num2;
    },

    //MU,IT : numeric.identity;

    ODD : function(number) {
        var temp = Math.ceil(Math.abs(number));
        temp = (temp & 1) ? temp : temp + 1;
        return (number > 0) ? temp : -temp;
    },

    PI : function() {
        return Math.PI;
    },

    POWER : function(number, power) {
        return Math.pow(number, power);
    },

    PRODUCT : function() {
        var result = 1;
        for (var i = 0; i < arguments.length; i++) {
            result *= arguments[i];
        }
        return result;
    },

    QUOTIENT : function(numerator, denominator) {
        return (numerator / denominator).toFixed(0);
    },

    RADIANS : function(number) {
        return number * Math.PI / 180;
    },

    RAND : function() {
        return Math.random();
    },

    RANDBETWEEN : function(bottom, top) {
        // Creative Commons Attribution 3.0 License
        // Copyright (c) 2012 eqcode
        return bottom + Math.ceil((top - bottom + 1) * Math.random()) - 1;
    },

    ROUND : function(number, digits) {
        return Math.round(number * Math.pow(10, digits)) / Math.pow(10, digits);
    },

    ROUNDDOWN : function(number, digits) {
        var sign = (number > 0) ? 1 : -1;
        return sign * (Math.floor(Math.abs(number) * Math.pow(10, digits))) / Math.pow(10, digits);
    },

    ROUNDUP : function(number, digits) {
        var sign = (number > 0) ? 1 : -1;
        return sign * (Math.ceil(Math.abs(number) * Math.pow(10, digits))) / Math.pow(10, digits);
    },

    SERIESSUM : function(x, n, m, coefficients) {
        var result = coefficients[0] * Math.pow(x, n);
        for (var i = 1; i < coefficients.length; i++) {
            result += coefficients[i] * Math.pow(x, n + i * m);
        }
        return result;
    },

    SEC : function(number) {
        return 1 / Math.cos(number);
    },

    SECH : function(number) {
        return 2 / (Math.exp(number) + Math.exp(-number));
    },

    SIGN : function(number) {
        if (number < 0) {
            return -1;
        } else if (number === 0) {
            return 0;
        } else {
            return 1;
        }
    },

    SIN : function(number) {
        return Math.sin(number);
    },

    SINH : function(number) {
        return (Math.exp(number) - Math.exp(-number)) / 2;
    },

    SQRT : function(number) {
        return Math.sqrt(number);
    },

    SQRTPI : function(number) {
        return Math.sqrt(number * Math.PI);
    },

    SUBTOTAL : function(function_code) {
        var result = [];
        for (var i = 1; i < arguments.length; i++) {
            switch (function_code) {
                case 1:
                    result[i - 1] = formula.statistic.AVERAGE(arguments[i]);
                    break;
                case 2:
                    result[i - 1] = formula.statistic.COUNT(arguments[i]);
                    break;
                case 3:
                    result[i - 1] = formula.statistic.COUNTA(arguments[i]);
                    break;
                case 4:
                    result[i - 1] = formula.statistic.MAX(arguments[i]);
                    break;
                case 5:
                    result[i - 1] = formula.statistic.MIN(arguments[i]);
                    break;
                case 6:
                    result[i - 1] = formula.statistic.PRODUCT(arguments[i]);
                    break;
                case 7:
                    result[i - 1] = formula.statistic.STDEV(arguments[i]);
                    break;
                case 8:
                    result[i - 1] = formula.statistic.STDEVP(arguments[i]);
                    break;
                case 9:
                    result[i - 1] = formula.math.SUM(arguments[i]);
                    break;
                case 10:
                    result[i - 1] = formula.statistic.VAR(arguments[i]);
                    break;
                case 11:
                    result[i - 1] = formula.statistic.VARP(arguments[i]);
                    break;
            }
        }
        return result;
    },

    SUBTRACT : function(num1, num2){
        if(num1 === '' && num2 === ''){
            return '';
        }


        num1 = isNaN(parseFloat(num1)) ? 0 : parseFloat(num1);
        num2 = isNaN(parseFloat(num2)) ? 0 : parseFloat(num2);

        return num1 - num2;
    },


    SUM : function(){
        var cell, a, floatVal, stringVal = '', result = 0;

        for(a = 0; a < arguments.length; a++){
            if(typeof(arguments[a]) == 'object'){
                for(cell in arguments[a]){
                    stringVal   += (typeof(arguments[a][cell]) != 'undefined') ? arguments[a][cell] : '';
                    floatVal    = !isNaN(parseFloat(arguments[a][cell], 10)) ? parseFloat(arguments[a][cell], 10) : 0;
                    result      += floatVal;
                }
            }else{
                stringVal   += (typeof(arguments[a]) != 'undefined') ? arguments[a] : '';
                floatVal    = !isNaN(parseFloat(arguments[a], 10)) ? parseFloat(arguments[a], 10) : 0;
                result      += floatVal;
            }
        }

        if(result === 0 && $.trim(stringVal) === ''){
            return '';
        }else{
            return result;
        }
    },

    SUMIF : function(range, criteria, sum_range) {
        var result = 0;
            range = utility.objectToArray(range);

        if(typeof(sum_range) == 'undefined'){
            sum_range = range;
        } else {
            sum_range = utility.objectToArray(sum_range);
        }

        for(var i = 0; i < range.length; i++) {
            if (this.evaluate(range[i] + criteria)) {
                result += sum_range[i];
            }
        }

        return result;
    },

    SUMIFS : function() {
        var criteria = (arguments.length - 1) / 2;
        var range = utility.objectToArray(arguments[0]);
        var result = 0;

        for (var i = 0; i < range.length; i++) {
            var fit = true;
            for (var j = 0; j < criteria; j++) {
                var criteria_clause = arguments[2 * j + 1];
                var criteria_range  = utility.objectToArray(arguments[2 * j + 2]);

                if (fit) {
                    fit = this.evaluate(criteria_range[i] + criteria_clause);
                }
            }
            result += (fit) ? range[i] : 0;
        }
        return result;
    },

    SUMPRODUCT : function() {
        for (var a in arguments) {
            arguments[a] = utility.objectToArray(arguments[a]);

            if (a > 0 && arguments[(a - 1)].length !== arguments[a].length) {
                return '#VALUE!';
            }
        }

        var resultArray = [];

        for(var i = 0; i < arguments.length; i++){
            for(var j = 0; j < arguments[i].length; j++){
                if(0 == i){
                    resultArray[j] = arguments[i][j];
                } else {
                    resultArray[j] = formula.math.MULTIPLY(resultArray[j] , arguments[i][j]);
                }
            }
        }

        return formula.math.SUM(resultArray);
    },

    SUMSQ : function() {
        var numbers = utility.toArray(arguments);
        var result = 0;
        for (var i = 0; i < numbers.length; i++) {
            result += ($.isNumeric(numbers[i])) ? numbers[i] * numbers[i] : 0;
        }
        return result;
    },

    SUMX2MY2 : function(array_x, array_y) {
        var result = 0;
        for (var i = 0; i < array_x.length; i++) {
            result += array_x[i] * array_x[i] - array_y[i] * array_y[i];
        }
        return result;
    },

    SUMX2PY2 : function(array_x, array_y) {
        var result = 0;
        for (var i = 0; i < array_x.length; i++) {
            result += array_x[i] * array_x[i] + array_y[i] * array_y[i];
        }
        return result;
    },

    SUMXMY2 : function(array_x, array_y) {
        var result = 0;
        for (var i = 0; i < array_x.length; i++) {
            result += Math.pow(array_x[i] - array_y[i], 2);
        }
        return result;
    },

    TAN : function(number) {
        return Math.tan(number);
    },

    TANH : function(number) {
        var e2 = Math.exp(2 * number);
        return (e2 - 1) / (e2 + 1);
    },

    TRUNC : function(number, digits) {
        digits = (typeof digits === 'undefined') ? 0 : digits;
        var sign = (number > 0) ? 1 : -1;
        return sign * (Math.floor(Math.abs(number) * Math.pow(10, digits))) / Math.pow(10, digits);
    }
},
    /**
 * financial formula group.
 * adapted from stoic's formula.js (http://www.stoic.com/pages/formula)
 * with modification to adapt Calx environment
 * @type {Object}
 */
financial: {
    ACCRINT : function(issue, first, settlement, rate, par, frequency, basis, method) {
        if(typeof(moment) == 'undefined'){
            return '#NAME?';
        }

        // Return error if either date is invalid
        if (!moment(issue).isValid() || !moment(first).isValid() || !moment(settlement).isValid()) {
            return '#VALUE!';
        }

        // Return error if either rate or par are lower than or equal to zero
        if (rate <= 0 || par <= 0) {
            return '#NUM!';
        }

        // Return error if frequency is neither 1, 2, or 4
        if ([1, 2, 4].indexOf(frequency) === -1) {
            return '#NUM!';
        }

        // Return error if basis is neither 0, 1, 2, 3, or 4
        if ([0, 1, 2, 3, 4].indexOf(basis) === -1) {
            return '#NUM!';
        }

        // Return error if issue greater than or equal to settlement
        if (moment(issue).diff(moment(settlement)) >= 0) {
            return '#NUM!';
        }

        // Set default values
        par = (typeof par === 'undefined') ? 0 : par;
        basis = (typeof basis === 'undefined') ? 0 : basis;
        method = (typeof method === 'undefined') ? true : method;

        // Compute accrued interest
        var factor = 0;
        var id = moment(new Date(issue));
        var fd = moment(new Date(first));
        var sd = moment(new Date(settlement));
        var days = (moment([id.year()]).isLeapYear()) ? 366 : 365;

        switch (basis) {
            case 0:
                // US (NASD) 30/360
                factor = formula.date.YEARFRAC(issue, settlement, basis);
                break;
            case 1:
                // Actual/actual
                factor = formula.date.YEARFRAC(issue, settlement, basis);
                break;
            case 2:
                // Actual/360
                factor = formula.date.YEARFRAC(issue, settlement, basis);
                break;
            case 3:
                // Actual/365
                factor = formula.date.YEARFRAC(issue, settlement, basis);
                break;
            case 4:
                // European 30/360
                factor = formula.date.YEARFRAC(issue, settlement, basis);
                break;
        }
        return par * rate * factor;
    },

    ACCRINTM : function() {
        return;
    },

    AMORDEGRC : function() {
        return;
    },

    AMORLINC : function() {
        return;
    },

    COUPDAYBS : function() {
        return;
    },

    COUPDAYS : function() {
        return;
    },

    COUPDAYSNC : function() {
        return;
    },

    COUPNCD : function() {
        return;
    },

    COUPNUM : function() {
        return;
    },

    COUPPCD : function() {
        return;
    },

    CUMIPMT : function(rate, periods, value, start, end, type) {
        // Credits: algorithm inspired by Apache OpenOffice
        // Credits: Ha,nes Stieb,tzhofer f,r the translations of function and variable names
        // Requires FV(: and PMT(: from js :http://stoic.com/formula/]

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        ////rate = eval(rate);
        ////periods = eval(periods);

        // Return error if either rate, periods, or value are lower than or equal to zero
        if (rate <= 0 || periods <= 0 || value <= 0) {
            return '#NUM!';
        }

        // Return error if start < 1, end < 1, or start > end
        if (start < 1 || end < 1 || start > end) {
            return '#NUM!';
        }

        // Return error if type is neither 0 nor 1
        if (type !== 0 && type !== 1) {
            return '#NUM!';
        }

        // Compute cumulative interest
        var payment = formula.financial.PMT(rate, periods, value, 0, type);
        var interest = 0;

        if (start === 1) {
            if (type === 0) {
                interest = -value;
                start++;
            }
        }

        for (var i = start; i <= end; i++) {
            if (type === 1) {
                interest += formula.financial.FV(rate, i - 2, payment, value, 1) - payment;
            } else {
                interest += formula.financial.FV(rate, i - 1, payment, value, 0);
            }
        }
        interest *= rate;

        // Return cumulative interest
        return interest;
    },

    CUMPRINC : function(rate, periods, value, start, end, type) {
        // Credits: algorithm inspired by Apache OpenOffice
        // Credits: Ha,nes Stieb,tzhofer f,r the translations of function and variable names
        // Requires FV(: and PMT(: from js :http://stoic.com/formula/]

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        ////rate = eval(rate);
        ////periods = eval(periods);

        // Return error if either rate, periods, or value are lower than or equal to zero
        if (rate <= 0 || periods <= 0 || value <= 0) {
            return '#NUM!';
        }

        // Return error if start < 1, end < 1, or start > end
        if (start < 1 || end < 1 || start > end) {
            return '#NUM!';
        }

        // Return error if type is neither 0 nor 1
        if (type !== 0 && type !== 1) {
            return '#NUM!';
        }

        // Compute cumulative principal
        var payment = formula.financial.PMT(rate, periods, value, 0, type);
        var principal = 0;
        if (start === 1) {
            if (type === 0) {
                principal = payment + value * rate;
            } else {
                principal = payment;
            }
            start++;
        }
        for (var i = start; i <= end; i++) {
            if (type > 0) {
                principal += payment - (formula.financial.FV(rate, i - 2, payment, value, 1) - payment) * rate;
            } else {
                principal += payment - formula.financial.FV(rate, i - 1, payment, value, 0) * rate;
            }
        }

        // Return cumulative principal
        return principal;
    },

    DB : function(cost, salvage, life, period, month) {
        // Initialize month
        month = (typeof month === 'undefined') ? 12 : month;

        // Return error if any of the parameters is not a number
        if (isNaN(cost) || isNaN(salvage) || isNaN(life) || isNaN(period) || isNaN(month)) {
            return '#VALUE!';
        }

        // Return error if any of the parameters is negative   [

        if (cost < 0 || salvage < 0 || life < 0 || period < 0) {
            return '#NUM!';
        }

        // Return error if month is not an integer between 1 and 12
        if ([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12].indexOf(month) === -1) {
            return '#NUM!';
        }

        // Return error if period is greater than life
        if (period > life) {
            return '#NUM!';
        }

        // Return 0 (zero) if salvage is greater than or equal to cost
        if (salvage >= cost) {
            return 0;
        }

        // Rate is rounded to three decimals places
        var rate = (1 - Math.pow(salvage / cost, 1 / life)).toFixed(3);

        // Compute initial depreciation
        var initial = cost * rate * month / 12;

        // Compute total depreciation
        var total = initial;
        var current = 0;
        var ceiling = (period === life) ? life - 1 : period;
        for (var i = 2; i <= ceiling; i++) {
            current = (cost - total) * rate;
            total += current;
        }

        // Depreciation for the first and last periods are special cases
        if (period === 1) {
            // First period
            return initial;
        } else if (period === life) {
            // Last period
            return (cost - total) * rate;
        } else {
            return current;
        }
    },

    DDB : function(cost, salvage, life, period, factor) {
        // Initialize factor
        factor = (typeof factor === 'undefined') ? 2 : factor;

        // Return error if any of the parameters is not a number
        if (isNaN(cost) || isNaN(salvage) || isNaN(life) || isNaN(period) || isNaN(factor)) {
            return '#VALUE!';
        }

        // Return error if any of the parameters is negative or if factor is null
        if (cost < 0 || salvage < 0 || life < 0 || period < 0 || factor <= 0) {
            return '#NUM!';
        }

        // Return error if period is greater than life
        if (period > life) {
            return '#NUM!';
        }

        // Return 0 (zero) if salvage is greater than or equal to cost
        if (salvage >= cost) {
            return 0;
        }

        // Compute depreciation
        var total = 0;
        var current = 0;
        for (var i = 1; i <= period; i++) {
            current = Math.min((cost - total) * (factor / life), (cost - salvage - total));
            total += current;
        }

        // Return depreciation
        return current;
    },

    DISC : function() {
        return;
    },

    DOLLARDE : function(dollar, fraction) {
        // Credits: algorithm inspired by Apache OpenOffice

        // Return error if any of the parameters is not a number
        if (isNaN(dollar) || isNaN(fraction)) {
            return '#VALUE!';
        }

        // Return error if fraction is negative
        if (fraction < 0) {
            return '#NUM!';
        }

        // Return error if fraction is greater than or equal to 0 and less than 1
        if (fraction >= 0 && fraction < 1) {
            return '#DIV/0!';
        }

        // Truncate fraction if it is not an integer
        fraction = parseInt(fraction, 10);

        // Compute integer part
        var result = parseInt(dollar, 10);

        // Add decimal part
        result += (dollar % 1) * Math.pow(10, Math.ceil(Math.log(fraction) / Math.LN10)) / fraction;

        // Round result
        var power = Math.pow(10, Math.ceil(Math.log(fraction) / Math.LN2) + 1);
        result = Math.round(result * power) / power;

        // Return converted dollar price
        return result;
    },

    DOLLARFR : function(dollar, fraction) {
        // Credits: algorithm inspired by Apache OpenOffice

        // Return error if any of the parameters is not a number
        if (isNaN(dollar) || isNaN(fraction)) {
            return '#VALUE!';
        }

        // Return error if fraction is negative
        if (fraction < 0) {
            return '#NUM!';
        }

        // Return error if fraction is greater than or equal to 0 and less than 1
        if (fraction >= 0 && fraction < 1) {
            return '#DIV/0!';
        }

        // Truncate fraction if it is not an integer
        fraction = parseInt(fraction, 10);

        // Compute integer part
        var result = parseInt(dollar, 10);

        // Add decimal part
        result += (dollar % 1) * Math.pow(10, -Math.ceil(Math.log(fraction) / Math.LN10)) * fraction;

        // Return converted dollar price
        return result;
    },

    DURATION : function() {
        return;
    },

    EFFECT : function(rate, periods) {
        // Return error if any of the parameters is not a number
        if (isNaN(rate) || isNaN(periods)) {
            return '#VALUE!';
        }

        // Return error if rate <=0 or periods < 1
        if (rate <= 0 || periods < 1) {
            return '#NUM!';
        }

        // Truncate periods if it is not an integer
        periods = parseInt(periods, 10);

        // Return effective annual interest rate
        return Math.pow(1 + rate / periods, periods) - 1;
    },

    FV : function(rate, periods, payment, value, type) {
        // Credits: algorithm inspired by Apache OpenOffice

        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;

        // Evaluate rate (TODO: replace with secure expression evaluator)
        //rate = eval(rate);

        // Return future value
        var result;
        if (rate === 0) {
            result = value + payment * periods;
        } else {
            var term = Math.pow(1 + rate, periods);
            if (type === 1) {
                result = value * term + payment * (1 + rate) * (term - 1.0) / rate;
            } else {
                result = value * term + payment * (term - 1) / rate;
            }
        }
        return -result;
    },

    FVSCHEDULE : function(principal, schedule) {
        // Initialize future value
        var future = principal;

        // Apply all interests in schedule
        for (var i = 0; i < schedule.length; i++) {
            // Return error if schedule value is not a number
            if (isNaN(schedule[i])) {
                return '#VALUE!';
            }

            // Apply scheduled interest
            future *= 1 + schedule[i];
        }

        // Return future value
        return future;
    },

    INTRATE : function() {
        return;
    },

    IPMT : function(rate, period, periods, present, future, type) {
        // Credits: algorithm inspired by Apache OpenOffice

        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        //rate = eval(rate);
        //periods = eval(periods);

        // Compute payment
        var payment = formula.financial.PMT(rate, periods, present, future, type);

        // Compute interest
        var interest;
        if (period === 1) {
            if (type === 1) {
                interest = 0;
            } else {
                interest = -present;
            }
        } else {
            if (type === 1) {
                interest = formula.financial.FV(rate, period - 2, payment, present, 1) - payment;
            } else {
                interest = formula.financial.FV(rate, period - 1, payment, present, 0);
            }
        }

        // Return interest
        return interest * rate;
    },

    IRR : function(valuesObject, guess) {
        // Credits: algorithm inspired by Apache OpenOffice

        var floatVal, values = [];
        for(var a in valuesObject){
            floatVal = parseFloat(valuesObject[a], 10);
            floatVal = isNaN(floatVal) ? 0 : floatVal;
            values.push(floatVal);
        }

        // Calculates the resulting amount
        var irrResult = function(values, dates, rate) {
            var r = rate + 1;
            var result = values[0];
            for (var i = 1; i < values.length; i++) {
                result += values[i] / Math.pow(r, (dates[i] - dates[0]) / 365);
            }
            return result;
        };

        // Calculates the first derivation
        var irrResultDeriv = function(values, dates, rate) {
            var r = rate + 1;
            var result = 0;
            for (var i = 1; i < values.length; i++) {
                var frac = (dates[i] - dates[0]) / 365;
                result -= frac * values[i] / Math.pow(r, frac + 1);
            }
            return result;
        };

        // Initialize dates and check that values contains at least one positive value and one negative value
        var dates = [];
        var positive = false;
        var negative = false;
        for (var i = 0; i < values.length; i++) {
            dates[i] = (i === 0) ? 0 : dates[i - 1] + 365;
            if (values[i] > 0) {
                positive = true;
            }
            if (values[i] < 0) {
                negative = true;
            }
        }

        // Return error if values does not contain at least one positive value and one negative value
        if (!positive || !negative) {
            return '#NUM!';
        }

        // Initialize guess and resultRate
        guess = (typeof guess === 'undefined') ? 0.1 : guess;
        var resultRate = guess;

        // Set maximum epsilon for end of iteration
        var epsMax = 1e-10;

        // Set maximum number of iterations
        var iterMax = 50;

        // Implement Newton's method
        var newRate, epsRate, resultValue;
        var iteration = 0;
        var contLoop = true;
        do {
            resultValue = irrResult(values, dates, resultRate);
            newRate = resultRate - resultValue / irrResultDeriv(values, dates, resultRate);
            epsRate = Math.abs(newRate - resultRate);
            resultRate = newRate;
            contLoop = (epsRate > epsMax) && (Math.abs(resultValue) > epsMax);
        } while (contLoop && (++iteration < iterMax));

        if (contLoop) {
            return '#NUM!';
        }

        // Return internal rate of return
        return resultRate;
    },

    ISPMT : function(rate, period, periods, value) {
        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        //rate = eval(rate);
        //periods = eval(periods);

        // Return interest
        return value * rate * (period / periods - 1);
    },

    MDURATION : function() {
        return;
    },

    MIRR : function(valuesObject, finance_rate, reinvest_rate) {

        var values = [];
        for(var a in valuesObject){
            values.push(valuesObject[a]);
        }
        // Initialize number of values
        var n = values.length;

        // Lookup payments (negative values) and incomes (positive values)
        var payments = [];
        var incomes = [];
        for (var i = 0; i < n; i++) {
            if (values[i] < 0) {
                payments.push(values[i]);
            } else {
                incomes.push(values[i]);
            }
        }

        // Return modified internal rate of return
        var num = -formula.financial.NPV(reinvest_rate, incomes) * Math.pow(1 + reinvest_rate, n - 1);
        var den = formula.financial.NPV(finance_rate, payments) * (1 + finance_rate);
        return Math.pow(num / den, 1 / (n - 1)) - 1;
    },

    NOMINAL : function(rate, periods) {
        // Return error if any of the parameters is not a number
        if (isNaN(rate) || isNaN(periods)) {
            return '#VALUE!';
        }

        // Return error if rate <=0 or periods < 1
        if (rate <= 0 || periods < 1) {
            return '#NUM!';
        }

        // Truncate periods if it is not an integer
        periods = parseInt(periods, 10);

        // Return nominal annual interest rate
        return (Math.pow(rate + 1, 1 / periods) - 1) * periods;
    },

    NPER : function(rate, payment, present, future, type) {
        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;

        // Initialize future value
        future = (typeof future === 'undefined') ? 0 : future;

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        //rate = eval(rate);

        // Return number of periods
        var num = payment * (1 + rate * type) - future * rate;
        var den = (present * rate + payment * (1 + rate * type));
        return Math.log(num / den) / Math.log(1 + rate);
    },


    NPV : function() {
        // Cast arguments to array
        var floatVal, args = [];
        for (var i = 0; i < arguments.length; i++) {
            if(typeof(arguments[i]) == 'object'){
                for(var a in arguments[i]){
                    floatVal = parseFloat(arguments[i][a], 10);
                    floatVal = isNaN(floatVal) ? 0 : floatVal;
                    args = args.concat([floatVal]);
                }
            }else{

                floatVal = parseFloat(arguments[i], 10);
                floatVal = isNaN(floatVal) ? 0 : floatVal;
                args = args.concat([floatVal]);
            }
        }

        // Lookup rate
        var rate = args[0];

        // Initialize net present value
        var value = 0;

        // Loop on all values
        for (var j = 1; j < args.length; j++) {
            value += args[j] / Math.pow(1 + rate, j);
        }

        // Return net present value
        return value;
    },

    ODDFPRICE : function() {
        return;
    },

    ODDFYIELD : function() {
        return;
    },

    ODDLPRICE : function() {
        return;
    },

    ODDLYIELD : function() {
        return;
    },

    PDURATION : function(rate, present, future) {
        // Return error if any of the parameters is not a number
        if (isNaN(rate) || isNaN(present) || isNaN(future)) {
            return '#VALUE!';
        }

        // Return error if rate <=0
        if (rate <= 0) {
            return '#NUM!';
        }

        // Return number of periods
        return (Math.log(future) - Math.log(present)) / Math.log(1 + rate);
    },

    PMT : function(rate, periods, present, future, type) {
        // Credits: algorithm inspired by Apache OpenOffice

        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;
        future = (typeof future === 'undefined') ? 0 : future;

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        //rate = eval(rate);
        //periods = eval(periods);

        // Return payment
        var result;
        if (rate === 0) {
            result = (present + future) / periods;
        } else {
            var term = Math.pow(1 + rate, periods);
            if (type === 1) {
                result = (future * rate / (term - 1) + present * rate / (1 - 1 / term)) / (1 + rate);
            } else {
                result = future * rate / (term - 1) + present * rate / (1 - 1 / term);
            }
        }
        return -result;
    },

    PPMT : function(rate, period, periods, present, future, type) {
        return formula.financial.PMT(rate, periods, present, future, type) - formula.financial.IPMT(rate, period, periods, present, future, type);
    },

    PRICE : function() {
        return;
    },

    PRICEDISC : function() {
        return;
    },

    PRICEMAT : function() {
        return;
    },

    PV : function(rate, periods, payment, future, type) {
        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;
        future = (typeof future === 'undefined') ? 0 : future;

        // Evaluate rate and periods (TODO: replace with secure expression evaluator)
        //rate = eval(rate);
        //periods = eval(periods);

        // Return present value
        if (rate === 0) {
            return -payment * periods - future;
        } else {
            return (((1 - Math.pow(1 + rate, periods)) / rate) * payment * (1 + rate * type) - future) / Math.pow(1 + rate, periods);
        }
    },

    RATE : function(periods, payment, present, future, type, guess) {
        // Credits: rabugento

        // Initialize guess
        guess = (typeof guess === 'undefined') ? 0.01 : guess;

        // Initialize future
        future = (typeof future === 'undefined') ? 0 : future;

        // Initialize type
        type = (typeof type === 'undefined') ? 0 : type;

        // Evaluate periods (TODO: replace with secure expression evaluator)
        //periods = eval(periods);

        // Set maximum epsilon for end of iteration
        var epsMax = 1e-10;

        // Set maximum number of iterations
        var iterMax = 50;

        // Implement Newton's method
        var y, y0, y1, x0, x1 = 0,
            f = 0,
            i = 0;
        var rate = guess;
        if (Math.abs(rate) < epsMax) {
            y = present * (1 + periods * rate) + payment * (1 + rate * type) * periods + future;
        } else {
            f = Math.exp(periods * Math.log(1 + rate));
            y = present * f + payment * (1 / rate + type) * (f - 1) + future;
        }
        y0 = present + payment * periods + future;
        y1 = present * f + payment * (1 / rate + type) * (f - 1) + future;
        i = x0 = 0;
        x1 = rate;
        while ((Math.abs(y0 - y1) > epsMax) && (i < iterMax)) {
            rate = (y1 * x0 - y0 * x1) / (y1 - y0);
            x0 = x1;
            x1 = rate;
            if (Math.abs(rate) < epsMax) {
                y = present * (1 + periods * rate) + payment * (1 + rate * type) * periods + future;
            } else {
                f = Math.exp(periods * Math.log(1 + rate));
                y = present * f + payment * (1 / rate + type) * (f - 1) + future;
            }
            y0 = y1;
            y1 = y;
            ++i;
        }
        return rate;
    },

    RECEIVED : function() {
        return;
    },

    RRI : function(periods, present, future) {
        // Return error if any of the parameters is not a number
        if (isNaN(periods) || isNaN(present) || isNaN(future)) {
            return '#VALUE!';
        }

        // Return error if periods or present is equal to 0 (zero)
        if (periods === 0 || present === 0) {
            return '#NUM!';
        }

        // Return equivalent interest rate
        return Math.pow(future / present, 1 / periods) - 1;
    },

    SLN : function(cost, salvage, life) {
        // Return error if any of the parameters is not a number
        if (isNaN(cost) || isNaN(salvage) || isNaN(life)) {
            return '#VALUE!';
        }

        // Return error if life equal to 0 (zero)
        if (life === 0) {
            return '#NUM!';
        }

        // Return straight-line depreciation
        return (cost - salvage) / life;
    },

    SYD : function(cost, salvage, life, period) {
        // Return error if any of the parameters is not a number
        if (isNaN(cost) || isNaN(salvage) || isNaN(life) || isNaN(period)) {
            return '#VALUE!';
        }

        // Return error if life equal to 0 (zero)
        if (life === 0) {
            return '#NUM!';
        }

        // Return error if period is lower than 1 or greater than life
        if (period < 1 || period > life) {
            return '#NUM!';
        }

        // Truncate period if it is not an integer
        period = parseInt(period, 10);

        // Return straight-line depreciation
        return (cost - salvage) * (life - period + 1) * 2 / (life * (life + 1));
    },

    TBILLEQ : function(settlement, maturity, discount) {
        // Return error if either date is invalid
        if (!moment(settlement).isValid() || !moment(maturity).isValid()) {
            return '#VALUE!';
        }

        // Return error if discount is lower than or equal to zero
        if (discount <= 0) {
            return '#NUM!';
        }

        // Return error if settlement is greater than maturity
        if (moment(settlement).diff(moment(maturity)) > 0) {
            return '#NUM!';
        }

        // Return error if maturity is more than one year after settlement
        if (moment(maturity).diff(moment(settlement), 'years') > 1) {
            return '#NUM!';
        }

        // Return bond-equivalent yield
        return (365 * discount) / (360 - discount * formula.date.DAYS360(settlement, maturity));
    },

    TBILLPRICE : function(settlement, maturity, discount) {
        // Return error if either date is invalid
        if (!moment(settlement).isValid() || !moment(maturity).isValid()) {
            return '#VALUE!';
        }

        // Return error if discount is lower than or equal to zero
        if (discount <= 0) {
            return '#NUM!';
        }

        // Return error if settlement is greater than maturity
        if (moment(settlement).diff(moment(maturity)) > 0) {
            return '#NUM!';
        }

        // Return error if maturity is more than one year after settlement
        if (moment(maturity).diff(moment(settlement), 'years') > 1) {
            return '#NUM!';
        }

        // Return bond-equivalent yield
        return 100 * (1 - discount * formula.date.DAYS360(settlement, maturity) / 360);
    },

    TBILLYIELD : function(settlement, maturity, price) {
        // Return error if either date is invalid
        if (!moment(settlement).isValid() || !moment(maturity).isValid()) {
            return '#VALUE!';
        }

        // Return error if price is lower than or equal to zero
        if (price <= 0) {
            return '#NUM!';
        }

        // Return error if settlement is greater than maturity
        if (moment(settlement).diff(moment(maturity)) > 0) {
            return '#NUM!';
        }

        // Return error if maturity is more than one year after settlement
        if (moment(maturity).diff(moment(settlement), 'years') > 1) {
            return '#NUM!';
        }

        // Return bond-equivalent yield
        return (100 - price) * 360 / (price * formula.date.DAYS360(settlement, maturity));
    },

    VDB : function() {
        return;
    },

    XIRR : function(valuesObject, dates, guess) {
        // Credits: algorithm inspired by Apache OpenOffice
        var values = [];
        for(var a in valuesObject){
            values.push(valuesObject[a]);
        }

        // Calculates the resulting amount
        var irrResult = function(values, dates, rate) {
            var r = rate + 1;
            var result = values[0];
            for (var i = 1; i < values.length; i++) {
                result += values[i] / Math.pow(r, moment(dates[i]).diff(moment(dates[0]), 'days') / 365);
            }
            return result;
        };

        // Calculates the first derivation
        var irrResultDeriv = function(values, dates, rate) {
            var r = rate + 1;
            var result = 0;
            for (var i = 1; i < values.length; i++) {
                var frac = moment(dates[i]).diff(moment(dates[0]), 'days') / 365;
                result -= frac * values[i] / Math.pow(r, frac + 1);
            }
            return result;
        };

        // Check that values contains at least one positive value and one negative value
        var positive = false;
        var negative = false;
        for (var i = 0; i < values.length; i++) {
            if (values[i] > 0) {
                positive = true;
            }
            if (values[i] < 0) {
                negative = true;
            }
        }

        // Return error if values does not contain at least one positive value and one negative value
        if (!positive || !negative) {
            return '#NUM!';
        }

        // Initialize guess and resultRate
        guess = guess || 0.1;
        var resultRate = guess;

        // Set maximum epsilon for end of iteration
        var epsMax = 1e-10;

        // Set maximum number of iterations
        var iterMax = 50;

        // Implement Newton's method
        var newRate, epsRate, resultValue;
        var iteration = 0;
        var contLoop = true;
        do {
            resultValue = irrResult(values, dates, resultRate);
            newRate = resultRate - resultValue / irrResultDeriv(values, dates, resultRate);
            epsRate = Math.abs(newRate - resultRate);
            resultRate = newRate;
            contLoop = (epsRate > epsMax) && (Math.abs(resultValue) > epsMax);
        } while (contLoop && (++iteration < iterMax));

        if (contLoop) {
            return '#NUM!';
        }

        // Return internal rate of return
        return resultRate;
    },

    XNPV : function(rate, values, dates) {
        var result = 0;
        for (var i = 0; i < values.length; i++) {
            result += values[i] / Math.pow(1 + rate, moment(dates[i]).diff(moment(dates[0]), 'days') / 365);
        }
        return result;
    },

    YIELD : function() {
        return;
    },

    YIELDDISC : function() {
        return;
    },

    YIELDMAT : function() {
        return
    }
},
    statistic: {
    AVEDEV : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        return jStat.sum(jStat(range).subtract(jStat.mean(range)).abs()[0]) / range.length;
    },

    AVERAGE : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var count = 0;
        var sigma = 0;
        var floatVal = 0;
        for (var i = 0; i < n; i++) {
            if (range[i] !== true && range[i] !== false) {
                floatVal = parseFloat(range[i]);
                sigma += isNaN(floatVal) ? 0 : floatVal;
                count++;
            }
        }
        return sigma / count;
    },

    AVERAGEA : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.mean(utility.arrayMerge(arguments));
    },

    AVERAGEIF : function(range, criteria, average_range) {
        average_range = (typeof average_range === 'undefined') ? range : average_range;
        var average_count = 0;
        var result = 0;
        for (var i = 0; i < range.length; i++) {
            if (eval(range[i] + criteria)) {
                result += average_range[i];
                average_count++;
            }
        }
        return result / average_count;
    },

    AVERAGEIFS : function() {
        var criteria = (arguments.length - 1) / 2;
        var range = arguments[0];
        var count = 0;
        var result = 0;
        for (var i = 0; i < range.length; i++) {
            var fit = true;
            for (var j = 0; j < criteria; j++) {
                if (!eval(arguments[2 * j + 1][i] + arguments[2 * j + 2])) {
                    fit = false;
                }
            }
            if (fit) {
                result += range[i];
                count++;
            }
        }
        return result / count;
    },

    BETADIST : function(x, alpha, beta, cumulative, A, B) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        A = (typeof A === 'undefined') ? 0 : A;
        B = (typeof B === 'undefined') ? 1 : B;
        x = (x - A) / (B - A);
        return (cumulative) ? jStat.beta.cdf(x, alpha, beta) : jStat.beta.pdf(x, alpha, beta);
    },

    BETAINV : function(probability, alpha, beta, A, B) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        A = (typeof A === 'undefined') ? 0 : A;
        B = (typeof B === 'undefined') ? 1 : B;
        return jStat.beta.inv(probability, alpha, beta) * (B - A) + A;
    },

    BINOMDIST : function(successes, trials, probability, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.binomial.cdf(successes, trials, probability) : jStat.binomial.pdf(successes, trials, probability);
    },

    BINOMDISTRANGE : function(trials, probability, successes, successes2) {
        successes2 = (typeof successes2 === 'undefined') ? successes : successes2;
        var result = 0;
        for (var i = successes; i <= successes2; i++) {
            result += formula.math.COMBIN(trials, i) * Math.pow(probability, i) * Math.pow(1 - probability, trials - i);
        }
        return result;
    },

    BINOMINV : function(trials, probability, alpha) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var x = 0;
        while (x <= trials) {
            if (jStat.binomial.cdf(x, trials, probability) >= alpha) {
                return x;
            }
            x++;
        }
    },

    CHISQDIST : function(x, k, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.chisquare.cdf(x, k) : jStat.chisquare.pdf(x, k);
    },

    CHISQDISTRT : function(x, k) {
        return;
    },

    CHISQINV : function(probability, k) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.chisquare.inv(probability, k);
    },

    CHISQINVRT : function() {
        return;
    },

    CHISQTEST : function() {
        return;
    },

    CONFIDENCENORM : function(alpha, sd, n) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.normalci(1, alpha, sd, n)[1] - 1;
    },

    CONFIDENCET : function(alpha, sd, n) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.tci(1, alpha, sd, n)[1] - 1;
    },

    CORREL : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.corrcoeff.apply(this, arguments);
    },

    COUNT : function() {
        return utility.arrayMerge(arguments).length;
    },

    COUNTA : function() {
        var range = utility.arrayMerge(arguments);
        return range.length - formula.statistic.COUNTBLANK(range);
    },

    COUNTBLANK : function() {
        var range = utility.arrayMerge(arguments);
        var blanks = 0;
        for (var i = 0; i < range.length; i++) {
            if (range[i] === null || range[i] === '') {
                blanks++;
            }
        }
        return blanks;
    },

    COUNTIF : function(range, criteria) {
        var matches = 0, i;
        for (i in range) {
            if (range[i].match(new RegExp(criteria))) {
                matches++;
            }
        }
        return matches;
    },

    COUNTIFS : function() {
        var criteria = (arguments.length - 1) / 2;
        var range = arguments[0];
        var result = 0;
        var i;
        for (i in range) {
            var fit = true;
            for (var j = 0; j < criteria; j++) {
                if (!eval(arguments[2 * j + 1][i] + arguments[2 * j + 2])) {
                    fit = false;
                }
            }
            result += (fit) ? 1 : 0;
        }
        return result;
    },

    COUNTUNIQUE : function () {
        return utility.unique(utility.arrayMerge(arguments)).length;
    },

    COVARIANCEP : function(array1, array2) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var mean1 = jStat.mean(array1);
        var mean2 = jStat.mean(array2);
        var result = 0;
        var n = array1.length;
        for (var i = 0; i < n; i++) {
            result += (array1[i] - mean1) * (array2[i] - mean2);
        }
        return result / n;
    },

    COVARIANCES : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.covariance.apply(this, arguments);
    },

    DEVSQ : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var mean = jStat.mean(range);
        var result = 0;
        for (var i = 0; i < range.length; i++) {
            result += Math.pow((range[i] - mean), 2);
        }
        return result;
    },

    EXPONDIST : function(x, lambda, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.exponential.cdf(x, lambda) : jStat.exponential.pdf(x, lambda);
    },

    FDIST : function(x, d1, d2, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.centralF.cdf(x, d1, d2) : jStat.centralF.pdf(x, d1, d2);
    },

    FDISTRT : function() {
        return;
    },

    FINV : function(probability, d1, d2) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.centralF.inv(probability, d1, d2);
    },

    FINVRT : function() {
        return;
    },

    FTEST : function() {
        return;
    },

    FISHER : function(x) {
        return Math.log((1 + x) / (1 - x)) / 2;
    },

    FISHERINV : function(y) {
        var e2y = Math.exp(2 * y);
        return (e2y - 1) / (e2y + 1);
    },

    FORECAST : function(x, data_y, data_x) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var xmean = jStat.mean(data_x);
        var ymean = jStat.mean(data_y);
        var n = data_x.length;
        var num = 0;
        var den = 0;
        for (var i = 0; i < n; i++) {
            num += (data_x[i] - xmean) * (data_y[i] - ymean);
            den += Math.pow(data_x[i] - xmean, 2);
        }
        var b = num / den;
        var a = ymean - b * xmean;
        return a + b * x;
    },

    FREQUENCY : function(data, bins) {
        var n = data.length;
        var b = bins.length;
        var r = [];
        for (var i = 0; i <= b; i++) {
            r[i] = 0;
            for (var j = 0; j < n; j++) {
                if (i === 0) {
                    if (data[j] <= bins[0]) {
                        r[0] += 1;
                    }
                } else if (i < b) {
                    if (data[j] > bins[i - 1] && data[j] <= bins[i]) {
                        r[i] += 1;
                    }
                } else if (i === b) {
                    if (data[j] > bins[b - 1]) {
                        r[b] += 1;
                    }
                }
            }
        }
        return r;
    },

    GAMMA : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.gammafn.apply(this, arguments);
    },

    GAMMADIST : function(x, alpha, beta, cumulative) {
        /*
           var shape = alpha;
           var scale = 1 / beta;
           return (cumulative) ? jStat.gamma.cdf(x, shape, scale) : jStat.gamma.pdf(x, shape, scale);
           */
        return;
    },

    GAMMAINV : function(probability, alpha, beta) {
        /*
           var shape = alpha;
           var scale = 1 / beta;
           return jStat.gamma.inv(probability, shape, scale);
           */
        return;
    },

    GAMMALN : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.gammaln.apply(this, arguments);
    },

    GAMMALNPRECISE : function() {
        return;
    },

    GAUSS : function(z) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.normal.cdf(z, 0, 1) - 0.5;
    },

    GEOMEAN : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.geomean(utility.arrayMerge(arguments));
    },

    GROWTH : function(known_y, known_x, new_x, use_const) {
        // Credits: Ilmari Karonen

        // Default values for optional parameters:
        var i;
        if (typeof(known_x) === 'undefined') {
            known_x = [];
            for (i = 1; i <= known_y.length; i++) {
                known_x.push(i);
            }
        }
        if (typeof(new_x) === 'undefined') {
            new_x = [];
            for (i = 1; i <= known_y.length; i++) {
                new_x.push(i);
            }
        }
        if (typeof(use_const) === 'undefined') {
            use_const = true;
        }

        // Calculate sums over the data:
        var n = known_y.length;
        var avg_x = 0;
        var avg_y = 0;
        var avg_xy = 0;
        var avg_xx = 0;
        for (i = 0; i < n; i++) {
            var x = known_x[i];
            var y = Math.log(known_y[i]);
            avg_x += x;
            avg_y += y;
            avg_xy += x * y;
            avg_xx += x * x;
        }
        avg_x /= n;
        avg_y /= n;
        avg_xy /= n;
        avg_xx /= n;

        // Compute linear regression coefficients:
        var beta;
        var alpha;
        if (use_const) {
            beta = (avg_xy - avg_x * avg_y) / (avg_xx - avg_x * avg_x);
            alpha = avg_y - beta * avg_x;
        } else {
            beta = avg_xy / avg_xx;
            alpha = 0;
        }

        // Compute and return result array:
        var new_y = [];
        for (i = 0; i < new_x.length; i++) {
            new_y.push(Math.exp(alpha + beta * new_x[i]));
        }
        return new_y;
    },

    HARMEAN : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var den = 0;
        for (var i = 0; i < n; i++) {
            den += 1 / range[i];
        }
        return n / den;
    },

    HYPGEOMDIST : function(x, n, M, N, cumulative) {
        function pdf(x, n, M, N) {
            return formula.math.COMBIN(M, x) * formula.math.COMBIN(N - M, n - x) / formula.math.COMBIN(N, n);
        }

        function cdf(x, n, M, N) {
            var result = 0;
            for (var i = 0; i <= x; i++) {
                result += pdf(i, n, M, N);
            }
            return result;
        }

        return (cumulative) ? cdf(x, n, M, N) : pdf(x, n, M, N);
    },

    INTERCEPT : function(data_y, data_x) {
        return formula.statistic.FORECAST(0, data_y, data_x);
    },

    KURT : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var mean = jStat.mean(range);
        var n = range.length;
        var sigma = 0;
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 4);
        }
        sigma = sigma / Math.pow(jStat.stdev(range, true), 4);
        return ((n * (n + 1)) / ((n - 1) * (n - 2) * (n - 3))) * sigma - 3 * (n - 1) * (n - 1) / ((n - 2) * (n - 3));
    },

    LARGE : function(array, k) {
        array = utility.objectToArray(array);
        return array.sort(function(a, b) {
            return b - a;
        })[k - 1];
    },

    LINEST : function(data_y, data_x) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var xmean = jStat.mean(data_x);
        var ymean = jStat.mean(data_y);
        var n = data_x.length;
        var num = 0;
        var den = 0;
        for (var i = 0; i < n; i++) {
            num += (data_x[i] - xmean) * (data_y[i] - ymean);
            den += Math.pow(data_x[i] - xmean, 2);
        }
        var m = num / den;
        var b = ymean - m * xmean;
        return [m, b];
    },

    LOGEST : function() {
        return;
    },

    LOGNORMDIST : function(x, mean, sd, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }

        return (cumulative) ? jStat.lognormal.cdf(x, mean, sd) : jStat.lognormal.pdf(x, mean, sd);
    },

    LOGNORMINV : function(probability, mean, sd) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.lognormal.inv(probability, mean, sd);
    },

    MAX : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var max = (n > 0) ? range[0] : 0;
        for (var i = 0; i < n; i++) {
            max = (range[i] > max && (range[i] !== true) && (range[i] !== false)) ? range[i] : max;
        }
        return max;
    },

    MAXA : function() {
        var range = utility.arrayMerge(arguments);
        return (range.length > 0) ? Math.max.apply(Math, range) : 0;
    },

    MEDIAN : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.median(utility.arrayMerge(arguments));
    },

    MIN : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var min = (n > 0) ? range[0] : 0;
        for (var i = 0; i < n; i++) {
            min = (range[i] < min && (range[i] !== true) && (range[i] !== false)) ? range[i] : min;
        }
        return min;
    },

    MINA : function() {
        var range = utility.arrayMerge(arguments);
        return (range.length > 0) ? Math.min.apply(Math, range) : 0;
    },

    MODEMULT : function() {
        // Credits: Roönaän
        var range = utility.arrayMerge(arguments),
            n = range.length,
            count = {},
            maxItems = [],
            max = 0,
            currentItem;
        for (var i = 0; i < n; i++) {
            currentItem = range[i];
            count[currentItem] = count[currentItem] ? count[currentItem] + 1 : 1;
            if (count[currentItem] > max) {
                max = count[currentItem];
                maxItems = [];
            }
            if (count[currentItem] === max) {
                maxItems[maxItems.length] = currentItem;
            }
        }
        return maxItems;
    },

    MODESNGL : function() {
        return formula.statistic.MODEMULT(utility.arrayMerge(arguments)).sort(function(a, b) {
            return a - b;
        })[0];
    },

    NEGBINOMDIST : function(k, r, p, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.negbin.cdf(k, r, p) : jStat.negbin.pdf(k, r, p);
    },

    NORMDIST : function(x, mean, sd, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        // Check parameters
        if (isNaN(x) || isNaN(mean) || isNaN(sd)) {
            return '#VALUE!';
        }
        if (sd <= 0) {
            return '#NUM!';
        }

        // Return normal distribution computed by jStat [http://jstat.org]
        return (cumulative) ? jStat.normal.cdf(x, mean, sd) : jStat.normal.pdf(x, mean, sd);
    },

    NORMINV : function(probability, mean, sd) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.normal.inv(probability, mean, sd);
    },

    NORMSDIST : function(z, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.normal.cdf(z, 0, 1) : jStat.normal.pdf(z, 0, 1);
    },

    NORMSINV : function(probability) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.normal.inv(probability, 0, 1);
    },

    PEARSON : function(data_x, data_y) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var xmean = jStat.mean(data_x);
        var ymean = jStat.mean(data_y);
        var n = data_x.length;
        var num = 0;
        var den1 = 0;
        var den2 = 0;
        for (var i = 0; i < n; i++) {
            num += (data_x[i] - xmean) * (data_y[i] - ymean);
            den1 += Math.pow(data_x[i] - xmean, 2);
            den2 += Math.pow(data_y[i] - ymean, 2);
        }
        return num / Math.sqrt(den1 * den2);
    },

    PERCENTILEEXC : function(array, k) {
        array = array.sort(function(a, b) {
            {
                return a - b;
            }
        });
        var n = array.length;
        if (k < 1 / (n + 1) || k > 1 - 1 / (n + 1)) {
            return '#NUM!';
        }
        var l = k * (n + 1) - 1;
        var fl = Math.floor(l);
        return utility.cleanFloat((l === fl) ? array[l] : array[fl] + (l - fl) * (array[fl + 1] - array[fl]));
    },

    PERCENTILEINC : function(array, k) {
        array = array.sort(function(a, b) {
            return a - b;
        });
        var n = array.length;
        var l = k * (n - 1);
        var fl = Math.floor(l);
        return utility.cleanFloat((l === fl) ? array[l] : array[fl] + (l - fl) * (array[fl + 1] - array[fl]));
    },

    PERCENTRANKEXC : function(array, x, significance) {
        array = array.sort(function(a, b) {
            return a - b;
        });
        var uniques = utility.unique(array);
        var n = array.length;
        var m = uniques.length;
        significance = (typeof significance === 'undefined') ? 3 : significance;
        var power = Math.pow(10, significance);
        var result = 0;
        var match = false;
        var i = 0;
        while (!match && i < m) {
            if (x === uniques[i]) {
                result = (array.indexOf(uniques[i]) + 1) / (n + 1);
                match = true;
            } else if (x >= uniques[i] && (x < uniques[i + 1] || i === m - 1)) {
                result = (array.indexOf(uniques[i]) + 1 + (x - uniques[i]) / (uniques[i + 1] - uniques[i])) / (n + 1);
                match = true;
            }
            i++;
        }
        return Math.floor(result * power) / power;
    },

    PERCENTRANKINC : function(array, x, significance) {
        array = array.sort(function(a, b) {
            return a - b;
        });
        var uniques = utility.unique(array);
        var n = array.length;
        var m = uniques.length;
        significance = (typeof significance === 'undefined') ? 3 : significance;
        var power = Math.pow(10, significance);
        var result = 0;
        var match = false;
        var i = 0;
        while (!match && i < m) {
            if (x === uniques[i]) {
                result = array.indexOf(uniques[i]) / (n - 1);
                match = true;
            } else if (x >= uniques[i] && (x < uniques[i + 1] || i === m - 1)) {
                result = (array.indexOf(uniques[i]) + (x - uniques[i]) / (uniques[i + 1] - uniques[i])) / (n - 1);
                match = true;
            }
            i++;
        }
        return Math.floor(result * power) / power;
    },

    PERMUT : function(number, number_chosen) {
        return formula.math.FACT(number) / formula.math.FACT(number - number_chosen);
    },

    PERMUTATIONA : function(number, number_chosen) {
        return Math.pow(number, number_chosen);
    },

    PHI : function(x) {
        return Math.exp(-0.5 * x * x) / data.SQRT2PI;
    },

    POISSONDIST : function(x, mean, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.poisson.cdf(x, mean) : jStat.poisson.pdf(x, mean);
    },

    PROB : function(range, probability, lower, upper) {
        if (typeof lower === 'undefined') {
            return 0;
        }

        upper = (typeof upper === 'undefined') ? lower : upper;
        if (lower === upper) {
            return (range.indexOf(lower) >= 0) ? probability[range.indexOf(lower)] : 0;
        }

        var sorted = range.sort(function(a, b) {
            return a - b;
        });
        var n = sorted.length;
        var result = 0;
        for (var i = 0; i < n; i++) {
            if (sorted[i] >= lower && sorted[i] <= upper) {
                result += probability[range.indexOf(sorted[i])];
            }
        }
        return result;
    },

    QUARTILEEXC : function(range, quart) {
        switch (quart) {
            case 1:
                return formula.statistic.PERCENTILEEXC(range, 0.25);
            case 2:
                return formula.statistic.PERCENTILEEXC(range, 0.5);
            case 3:
                return formula.statistic.PERCENTILEEXC(range, 0.75);
            default:
                return '#NUM!';
        }
    },

    QUARTILEINC : function(range, quart) {
        switch (quart) {
            case 1:
                return formula.statistic.PERCENTILEINC(range, 0.25);
            case 2:
                return formula.statistic.PERCENTILEINC(range, 0.5);
            case 3:
                return formula.statistic.PERCENTILEINC(range, 0.75);
            default:
                return '#NUM!';
        }
    },

    RANKAVG : function(number, range, order) {
        order = (typeof order === 'undefined') ? false : order;
        var sort = (order) ? function(a, b) {
            return a - b;
        } : function(a, b) {
            return b - a;
        };
        range = range.sort(sort);
        var count = utility.countIn(range, number);
        return (count > 1) ? (2 * range.indexOf(number) + count + 1) / 2 : range.indexOf(number) + 1;
    },

    RANKEQ : function(number, range, order) {
        order = (typeof order === 'undefined') ? false : order;
        var sort = (order) ? function(a, b) {
            return a - b;
        } : function(a, b) {
            return b - a;
        };
        range = range.sort(sort);
        return range.indexOf(number) + 1;
    },

    RSQ : function(data_x, data_y) {
        return Math.pow(formula.statistic.PEARSON(data_x, data_y), 2);
    },

    SKEW : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var mean = jStat.mean(range);
        var n = range.length;
        var sigma = 0;
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 3);
        }
        return n * sigma / ((n - 1) * (n - 2) * Math.pow(jStat.stdev(range, true), 3));
    },

    SKEWP : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var mean = jStat.mean(range);
        var n = range.length;
        var m2 = 0;
        var m3 = 0;
        for (var i = 0; i < n; i++) {
            m3 += Math.pow(range[i] - mean, 3);
            m2 += Math.pow(range[i] - mean, 2);
        }
        m3 = m3 / n;
        m2 = m2 / n;
        return m3 / Math.pow(m2, 3 / 2);
    },

    SLOPE : function(data_y, data_x) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var xmean = jStat.mean(data_x);
        var ymean = jStat.mean(data_y);
        var n = data_x.length;
        var num = 0;
        var den = 0;
        for (var i = 0; i < n; i++) {
            num += (data_x[i] - xmean) * (data_y[i] - ymean);
            den += Math.pow(data_x[i] - xmean, 2);
        }
        return num / den;
    },

    SMALL : function(array, k) {
        return array.sort(function(a, b) {
            return a - b;
        })[k - 1];
    },

    STANDARDIZE : function(x, mean, sd) {
        return (x - mean) / sd;
    },

    STDEVA : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var mean = jStat.mean(range);
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 2);
        }
        return Math.sqrt(sigma / (n - 1));
    },

    STDEVP : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var count = 0;
        var mean = formula.statistic.AVERAGE(range);
        for (var i = 0; i < n; i++) {
            if (range[i] !== true && range[i] !== false) {
                sigma += Math.pow(range[i] - mean, 2);
                count++;
            }
        }
        return Math.sqrt(sigma / count);
    },

    STDEVPA : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var mean = jStat.mean(range);
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 2);
        }
        return Math.sqrt(sigma / n);
    },

    STDEVS : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var count = 0;
        var mean = formula.statistic.AVERAGE(range);
        for (var i = 0; i < n; i++) {
            if (range[i] !== true && range[i] !== false) {
                sigma += Math.pow(range[i] - mean, 2);
                count++;
            }
        }
        return Math.sqrt(sigma / (count - 1));
    },

    STEYX : function(data_y, data_x) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var xmean = jStat.mean(data_x);
        var ymean = jStat.mean(data_y);
        var n = data_x.length;
        var lft = 0;
        var num = 0;
        var den = 0;
        for (var i = 0; i < n; i++) {
            lft += Math.pow(data_y[i] - ymean, 2);
            num += (data_x[i] - xmean) * (data_y[i] - ymean);
            den += Math.pow(data_x[i] - xmean, 2);
        }
        return Math.sqrt((lft - num * num / den) / (n - 2));
    },

    TDIST : function(x, df, cumulative) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return (cumulative) ? jStat.studentt.cdf(x, df) : jStat.studentt.pdf(x, df);
    },

    TDIST2T : function() {
        return;
    },

    TDISTRT : function() {
        return;
    },

    TINV : function(probability, df) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        return jStat.studentt.inv(probability, df);
    },

    TINV2T : function() {
        return;
    },

    TTEST : function() {
        return;
    },

    TREND : function() {
        return;
    },

    TRIMMEAN : function(range, percent) {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var n = range.length;
        var trim = formula.math.FLOOR(range.length * percent, 2) / 2;
        return jStat.mean(utility.initial(utility.rest(range.sort(function(a, b) {
            return a - b;
        }), trim), trim));
    },

    VARA : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var mean = jStat.mean(range);
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 2);
        }
        return sigma / (n - 1);
    },

    VARP : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var count = 0;
        var mean = formula.statistic.AVERAGE(range);
        for (var i = 0; i < n; i++) {
            if (range[i] !== true && range[i] !== false) {
                sigma += Math.pow(range[i] - mean, 2);
                count++;
            }
        }
        return sigma / count;
    },

    VARPA : function() {
        if(typeof(jStat) == 'undefined'){
            return data.ERRKEY.jStatRequired;
        }
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var mean = jStat.mean(range);
        for (var i = 0; i < n; i++) {
            sigma += Math.pow(range[i] - mean, 2);
        }
        return sigma / n;
    },

    VARS : function() {
        var range = utility.arrayMerge(arguments);
        var n = range.length;
        var sigma = 0;
        var count = 0;
        var mean = formula.statistic.AVERAGE(range);
        for (var i = 0; i < n; i++) {
            if (range[i] !== true && range[i] !== false) {
                sigma += Math.pow(range[i] - mean, 2);
                count++;
            }
        }
        return sigma / (count - 1);
    },

    WEIBULLDIST : function(x, alpha, beta, cumulative) {
        return (cumulative) ? 1 - Math.exp(-Math.pow(x / beta, alpha)) : Math.pow(x, alpha - 1) * Math.exp(-Math.pow(x / beta, alpha)) * alpha / Math.pow(beta, alpha);
    },

    ZTEST : function(range, x, sigma) {
        var n = range.length;
        var sd = (typeof sigma === 'undefined') ? formula.statistic.STDEVS(range) : sigma;
        return 1 - formula.statistic.NORMSDIST((formula.statistic.AVERAGE(range) - x) / (sd / Math.sqrt(n)), formula.logical.TRUE);
    }
},
    /**
 * logical formula group.
 * adapted from stoic's formula.js (http://www.stoic.com/pages/formula)
 * with modification to adapt Calx environment
 * @type {Object}
 */
logical : {
    AND : function() {
        var result = true;
        for (var i = 0; i < arguments.length; i++) {
            if (!arguments[i]) {
                result = false;
            }
        }
        return result;
    },

    CHOOSE : function(){
        var key = arguments[0];

        return (typeof(arguments[key]) == 'undefined') ? '#NUM!' : arguments[key];
    },

    FALSE : function(){
        return false;
    },

    IF : function(test, then_value, otherwise_value) {
        if (test) {
            return (typeof then_value === 'undefined') ? true : then_value;
        } else {
            return (typeof otherwise_value === 'undefined') ? true : otherwise_value;
        }
    },

    IFERROR : function(value, value_if_error) {
        return (data.ERROR.indexOf(value) >= 0) ? value_if_error : value;
    },

    IFNA : function(value, value_if_na) {
        return (value === '#N/A') ? value_if_na : value;
    },

    NOT : function(logical) {
        return !logical;
    },

    OR : function() {
        var result = false;
        for (var i = 0; i < arguments.length; i++) {
            if (arguments[i]) {
                result = true;
            }
        }
        return result;
    },

    SWITCH : function() {
        var result;
        if (arguments.length > 0) {
            var targetValue = arguments[0];
            var argc = arguments.length - 1;
            var switchCount = Math.floor(argc / 2);
            var switchSatisfied = false;
            var defaultClause = argc % 2 === 0 ? null : arguments[arguments.length - 1];

            if (switchCount) {
                for (var index = 0; index < switchCount; index++) {
                    if (targetValue == arguments[index * 2 + 1]) {
                        result = arguments[index * 2 + 2];
                        switchSatisfied = true;
                        break;
                    }
                }
            }

            if (!switchSatisfied && defaultClause) {
                result = defaultClause;
            }
        }

        return result;
    },

    TRUE : function() {
        return true;
    },

    XOR : function() {
        var result = 0;
        for (var i = 0; i < arguments.length; i++) {
            if (arguments[i]) {
                result++;
            }
        }
        return (Math.floor(Math.abs(result)) & 1) ? true : false;
    },

    NULL : function(){
        return null;
    }


},
    geometry : {
    
},
    text:{
    CONCAT : function(){
        var result = '', cell;

        for(cell in arguments){
            if(typeof(arguments[cell]) == 'object'){
                result += formula.text.CONCAT.apply(this, arguments[cell]);
            }else{
                result += arguments[cell];
            }
        }

        return result;
    },

    CHAR : function(number) {
        return String.fromCharCode(number);
    },

    CLEAN : function(text) {
        var re = /[\0-\x1F]/g;
        return text.replace(re, "");
    },

    CODE : function(text) {
        return text.charCodeAt(0);
    },

    CONCATENATE : function() {
        var string = '';
        for (var i = 0; i < arguments.length; i++) {
            if (arguments[i] !== null && arguments[i] !== undefined) {
                string += arguments[i];
            }
        }

        return string;
    },

    DOLLAR : function(number, decimals) {

        if(typeof(numeral) == 'undefined'){
            return '#NAME?';
        }
        decimals = (typeof decimals === 'undefined') ? 2 : decimals;
        var format = '';
        if (decimals <= 0) {
            number = Math.round(number * Math.pow(10, decimals)) / Math.pow(10, decimals);
            format = '($0,0)';
        } else if (decimals > 0) {
            format = '($0,0.' + new Array(decimals + 1).join('0') + ')';
        }
        return numeral(number).format(format);
    },

    EXACT : function(text1, text2) {
        return text1 === text2;
    },

    FIND : function(find_text, within_text, position) {
        position = (typeof position === 'undefined') ? 0 : position;
        return within_text ? within_text.indexOf(find_text, position - 1) + 1 : null;
    },

    FIXED : function(number, decimals, no_commas) {
        if(typeof(numeral) == 'undefined'){
            return '#NAME?';
        }
        decimals = (typeof decimals === 'undefined') ? 2 : decimals;
        no_commas = (typeof no_commas === 'undefined') ? false : no_commas;
        var format = no_commas ? '0' : '0,0';
        if (decimals <= 0) {
            number = Math.round(number * Math.pow(10, decimals)) / Math.pow(10, decimals);
        } else if (decimals > 0) {
            format += '.' + new Array(decimals + 1).join('0');
        }
        return numeral(number).format(format);
    },

    HTML2TEXT : function(value) {
        var result = '';

        if (value) {
            if (value instanceof Array) {
                value.forEach(function(line) {
                    if (result !== '') {
                        result += '\n';
                    }
                    result += (line.replace(/<(?:.|\n)*?>/gm, ''));
                });
            } else {
                result = value.replace(/<(?:.|\n)*?>/gm, '');
            }
        }

        return result;
    },

    HUMANIZE : function(value) {
        if (value instanceof Date) {
            var dvalue = moment(value);
            if (dvalue.hours() || dvalue.minutes() || dvalue.seconds()) {
                return dvalue.format("dddd, MMMM Do YYYY, h:mm:ss");
            } else {
                return dvalue.format("dddd, MMMM Do YYYY");
            }
        }

        return value;
    },

    JOIN : function(array, separator) {
        return array.join(separator);
    },

    LEFT : function(text, number) {
        number = (typeof number === 'undefined') ? 1 : number;
        return text ? text.substring(0, number) : null;
    },

    LEN : function(text) {
        return (text+'').length;
    },

    LOWER : function(text) {
        return text ? text.toLowerCase() : text;
    },

    MID : function(text, start, number) {
        return text.substring(start - 1, number);
    },

    NUMBERVALUE : function(text, decimal_separator, group_separator) {
        decimal_separator = (typeof decimal_separator === 'undefined') ? '.' : decimal_separator;
        group_separator = (typeof group_separator === 'undefined') ? ',' : group_separator;
        return Number(text.replace(decimal_separator, '.').replace(group_separator, ''));
    },

    PROPER : function(text) {
        return text.replace(/\w\S*/g, function(txt) {
            return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
        });
    },

    REGEXEXTRACT : function(text, regular_expression) {
        var match = text.match(new RegExp(regular_expression));
        return match ? match[0] : null;
    },

    REGEXMATCH : function(text, regular_expression, full) {
        var match = text.match(new RegExp(regular_expression));
        return full ? match : (text.match(new RegExp(regular_expression)) ? true : false);
    },

    REGEXREPLACE : function(text, regular_expression, replacement) {
        return text.replace(new RegExp(regular_expression), replacement);
    },

    REPLACE : function(text, position, length, new_text) {
        return text.substr(0, position - 1) + new_text + text.substr(position - 1 + length);
    },

    REPT : function(text, number) {
        return new Array(number + 1).join(text);
    },

    RIGHT : function(text, number) {
        number = (typeof number === 'undefined') ? 1 : number;
        return text ? text.substring(text.length - number) : null;
    },

    ROMAN : function(number) {
        // The MIT License
        // Copyright (c) 2008 Steven Levithan
        var digits = String(number).split('');
        var key = ['', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM', '', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC', '', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'];
        var roman = '';
        var i = 3;
        while (i--) {
            roman = (key[+digits.pop() + (i * 10)] || '') + roman;
        }
        return new Array(+digits.join('') + 1).join('M') + roman;
    },

    SEARCH : function(find_text, within_text, position) {
        position = (typeof position === 'undefined') ? 0 : position;
        return within_text.toLowerCase().indexOf(find_text.toLowerCase(), position - 1) + 1;
    },

    SPLIT : function(text, separator) {
        text = $.trim(text);
        return text.split(text, separator || /\s+/);
    },

    SUBSTITUTE : function(text, old_text, new_text, occurrence) {
        if (!text || !old_text || !new_text) {
            return text;
        } else if (typeof occurrence === 'undefined') {
            return text.replace(new RegExp(old_text, 'g'), new_text);
        } else {
            var index = 0;
            var i = 0;
            while (text.indexOf(old_text, index) > 0) {
                index = text.indexOf(old_text, index + 1);
                i++;
                if (i === occurrence) {
                    return text.substring(0, index) + new_text + text.substring(index + old_text.length);
                }
            }
        }
    },

    T : function(value) {
        return (typeof value === "string") ? value : null;
    },

    TEXT : function(value, format) {
        if(typeof(numeral) == 'undefined'){
            return '#NAME?';
        }
        var text = '';

        if (value) {
            if (value instanceof Object) {
                try {
                    text = JSON.stringify(value);
                } catch (err) {
                    // ignore
                }
            } else if (typeof value === 'string') {
                if (format) {
                    text = (format.indexOf('0') >= 0) ? numeral(value).format(format) : moment(new Date(value)).format(format);
                } else {
                    text = value;
                }
            } else if (value.toString && typeof value.toString === 'function') {
                text = value.toString();
            }
        }

        return text;
    },

    TRIM : function(text){
        return $.trim(text);
    },

    UNICHAR : function(number){
        return formula.text.CHAR(number);
    },

    UNICODE : function(text){
        return formula.text.CODE(text);
    },

    UPPER : function(text) {
        return text.toUpperCase();
    },

    VALUE : function(text) {
        if(typeof(numeral) == 'undefined'){
            return '#NAME?';
        }
        return numeral().unformat(text);
    }
},
    trigonometry:{
    
},
    general: {

    VLOOKUP: function(value, table, colIndex, approx) {
        var col, row, rowLength, colLength;

        if (typeof(table == 'object') && table.constructor.name == 'Object') {
            table = utility.rangeToTable(table);
        }

        rowLength = table.length;
        colLength = table[0].length;
        colIndex  = colIndex - 1;
        /** default approx to false */
        approx = typeof(approx) == 'undefined' ? false : approx;

        if (colIndex > colLength - 1) {
            return '#REF!';
        }

        if (colIndex < 0) {
            return '#VALUE!';
        }

        if (false == approx) {
            for (row = 0; row < rowLength; row++) {
                if (value == table[row][0]) {
                    return table[row][colIndex];
                }
            }

            return '#N/A!';
        } else {
            var delta = {}, deltaMax, deltaLength, difference;

            /** collect the difference between value on index 0, dismiss if delta is positive */
            for (row = 0; row < rowLength; row++) {
                if (value == table[row][0]) {
                    return table[row][colIndex];
                }

                difference = table[row][0] - value;

                if (difference < 0) {
                    delta[row] = difference;
                }
            }

            var deltaLength = delta.length;
            var deltaMax = null;
            var rowIndex = null;


            for (var a in delta) {
                if (deltaMax == null) {
                    deltaMax = delta[a];
                    rowIndex = a;
                } else {
                    deltaMax = (deltaMax > delta[a]) ? deltaMax : delta[a];
                    rowIndex = (deltaMax > delta[a]) ? rowIndex : a;
                }
            }

            if (rowIndex == null) {
                return '#N/A!';
            }

            return table[rowIndex][colIndex];
        }
    },

    HLOOKUP: function(value, table, rowIndex, approx) {
        if (typeof(table == 'object')) {
            table = utility.rangeToTable(table);
        }

        table = utility.transposeTable(table);

        return formula.general.VLOOKUP(value, table, rowIndex, approx);
    },

    LOOKUP: function(value, lookup, target) {
        var lookupIndex, lookupLength, targetIndex, targetLength, delta = [],
            deltaLength, deltaIndex, deltaMax, deltaMin;

        target = typeof target == 'undefined' ? false : target;

        if (typeof(lookup == 'object') && lookup.constructor.name == 'Object') {
            lookup = utility.objectToArray(lookup);
            lookupLength = lookup.length;
        }

        if (typeof(target == 'object') && target.constructor.name == 'Object') {
            target = utility.objectToArray(target);
            targetLength = target.length;
        }

        if (value < Math.min.apply(Math, lookup)) {
            return '#N/A!';
        }

        for (lookupIndex = 0; lookupIndex < lookupLength; lookupIndex++) {

            if (value == lookup[lookupIndex]) {
                return target ? target[lookupIndex] : lookup[lookupIndex];
            } else {
                delta[lookupIndex] = value - lookup[lookupIndex];
            }
        }

        /** convert minus to max */
        deltaLength = delta.length;
        deltaMax = Math.max.apply(Math, delta);
        for (deltaIndex = 0; deltaIndex < deltaLength; deltaIndex++) {
            if (delta[deltaIndex] < 0) {
                delta[deltaIndex] = deltaMax;
            }
        }

        deltaMin = Math.min.apply(Math, delta);
        lookupIndex = delta.indexOf(deltaMin);

        return (target) ? target[lookupIndex] : lookup[lookupIndex];

    },

    SERVER: function() {
        if (this.config.ajaxUrl == null) {
            return data.ERRKEY.ajaxUrlRequired;
        }

        var result,
            funcName = arguments[0],
            params = {};

        for (var a = 1; a < arguments.length; a++) {
            params['params[' + a + ']'] = arguments[a];
        }

        params['function'] = funcName;

        $.ajax({
            url: this.config.ajaxUrl,
            method: this.config.ajaxMethod,
            data: params,
            async: false,
            success: function(response) {
                result = response;
            },
            error: function(response) {
                result = data.ERRKEY.sendRequestError;
            }
        });

        return result;
    },

    GRAPH: function(data, options) {

        var graphOptions = {},
            cellElement = this.getActiveCell().el,
            plotOptions = {},
            options = (typeof(options) == 'undefined') ? [] : options,
            keyval, graphData;

        /**
         * parsing option come from formula into javascript object
         */
        for (var a = 0; a < options.length; a++) {
            keyval = options[a].split('=');
            graphOptions[keyval[0]] = keyval[1];
        }

        /**
         * setup default height and width
         */
        if (!cellElement.height()) {
            cellElement.css('height', '300px');
        }

        if (!cellElement.width) {
            cellElement.css('width', '300px');
        }

        switch (graphOptions.type) {
            case 'bar':
                graphData = utility.rangeToTable(data);
                if (typeof(graphOptions.reverse != 'undefined') && graphOptions.reverse == 'true') {
                    graphData.reverse();
                }
                plotOptions.series = {
                    bars: {
                        show: true,
                        barWidth: 0.6,
                        align: "center"
                    },
                    stack: true
                };
                if (typeof(graphOptions.bar_orientation) != 'undefined' && graphOptions.bar_orientation == 'horizontal') {
                    plotOptions.series.bars.horizontal = true;
                }
                break;

            case 'pie':
                graphData = utility.objectToArray(data);
                plotOptions.series = {
                    pie: {
                        show: true,
                        radius: 0.8
                    }
                };
                plotOptions.legend = {
                    show: false
                }
                break;

            case 'doughnut':
            case 'donut':
                graphData = utility.objectToArray(data);
                plotOptions.series = {
                    pie: {
                        show: true,
                        innerRadius: 0.5,
                        radius: 0.8
                    }
                };
                plotOptions.legend = {
                    show: false
                }
                break;

            default:
                graphData = utility.rangeToTable(data);
                if (typeof(graphOptions.reverse != 'undefined') && graphOptions.reverse == 'true') {
                    graphData.reverse();
                }
                break;
        }

        /**
         * change the table orientation if configured
         */
        if (typeof(graphOptions.orientation) != 'undefined' && graphOptions.orientation == 'vertical') {
            graphData = utility.transposeTable(graphData);
        }

        /**
         * parsing label as x-axis label
         */
        if (typeof(graphOptions.label) != 'undefined') {
            var label = this.evaluate(graphOptions.label),
                label = utility.objectToArray(label),
                rowLength = graphData.length,
                colLength, row, col, data;

            for (row = 0; row < rowLength; row++) {

                colLength = graphData[row].length;

                for (col = 0; col < colLength; col++) {
                    data = graphData[row][col];
                    graphData[row][col] = [label[col], data];
                }
            }

            plotOptions.xaxis = {
                mode: "categories",
                tickLength: 0
            };
        } else {

            var rowLength = graphData.length,
                colLength, row, col, data;

            for (row = 0; row < rowLength; row++) {

                colLength = graphData[row].length;

                for (col = 0; col < colLength; col++) {
                    data = graphData[row][col];
                    if (typeof(graphOptions.bar_orientation) != 'undefined' && graphOptions.bar_orientation == 'horizontal') {
                        graphData[row][col] = [data, col];
                    } else {
                        graphData[row][col] = [col, data];
                    }
                }
            }
        }

        /**
         * parsing legend and merge with the graph data
         */
        if (typeof(graphOptions.legend) != 'undefined') {
            var legend = this.evaluate(graphOptions.legend),
                legend = utility.objectToArray(legend),
                newGraphData = [];

            for (var graphLength = 0; graphLength < graphData.length; graphLength++) {
                newGraphData.push({
                    label: legend[graphLength],
                    data: graphData[graphLength]
                });
            }

            graphData = newGraphData;
        }

        /**
         * hide and show axis label
         */
        if (typeof(graphOptions.show_x_axis) != 'undefined' && graphOptions.show_x_axis == 'false') {
            plotOptions.xaxis = plotOptions.xaxis || {};
            plotOptions.xaxis.show = false;
        }

        if (typeof(graphOptions.show_y_axis) != 'undefined' && graphOptions.show_y_axis == 'false') {
            plotOptions.yaxis = plotOptions.yaxis || {};
            plotOptions.yaxis.show = false;
        }

        plotOptions.grid = {
            backgroundColor: {
                colors: ["#fff", "#eee"]
            },
            borderWidth: {
                top: 0,
                right: 0,
                bottom: 0,
                left: 0
            }
        };


        setTimeout(function() {
            $.plot(cellElement, graphData, plotOptions);
        }, 100);


        return false;

    }
},
    engineering: {

    /**
     * Implement BIN2DEC function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Converting binary number to decimal number
     * @param {[type]} number [description]
     */
    BIN2DEC: function(number) {
        // Return error if number is not binary or contains more than 10 characters (10 digits)
        if (!utility.isValidBinary(number)) {
            return '#NUM!';
        }

        // Convert binary number to decimal
        var result = parseInt(number, 2);

        // Handle negative numbers
        var stringified = number.toString();
        if (stringified.length === 10 && stringified.substring(0, 1) === '1') {
            return parseInt(stringified.substring(1), 2) - 512;
        } else {
            return result;
        }
    },

    /**
     * Implement BIN2HEX function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Convert binary number into hexadecimal number
     * @param {integer} number [description]
     * @param {string} places [description]
     */
    BIN2HEX: function(number, places) {
        // Return error if number is not binary or contains more than 10 characters (10 digits)
        if (!utility.isValidBinary(number)) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character hexadecimal number if number is negative
        var stringified = number.toString();
        if (stringified.length === 10 && stringified.substring(0, 1) === '1') {
            return (1099511627264 + parseInt(stringified.substring(1), 2)).toString(16);
        }

        // Convert binary number to hexadecimal
        var result = parseInt(number, 2).toString(16);

        // Return hexadecimal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    /**
     * Implement BIN2OCT function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Convert binary number into octal number
     * @param {integer} number [description]
     * @param {string}  places [description]
     */
    BIN2OCT: function(number, places) {
        // Return error if number is not binary or contains more than 10 characters (10 digits)
        if (!utility.isValidBinary(number)) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character octal number if number is negative
        var stringified = number.toString();
        if (stringified.length === 10 && stringified.substring(0, 1) === '1') {
            return (1073741312 + parseInt(stringified.substring(1), 2)).toString(8);
        }

        // Convert binary number to octal
        var result = parseInt(number, 2).toString(8);

        // Return octal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    /**
     * Implement BITAND function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Bitwise AND operator
     * @param {integer} number1 [description]
     * @param {integer} number2 [description]
     */
    BITAND: function(number1, number2) {
        number1 = parseFloat(number1, 10);
        number2 = parseFloat(number2, 10);

        // Return error if either number is a non-numeric value
        if (isNaN(number1) || isNaN(number2)) {
            return '#VALUE!';
        }

        // Return error if either number is less than 0
        if (number1 < 0 || number2 < 0) {
            return '#NUM!';
        }

        // Return error if either number is a non-integer
        if (Math.floor(number1) !== number1 || Math.floor(number2) !== number2) {
            return '#NUM!';
        }

        // Return error if either number is greater than (2^48)-1
        if (number1 > 281474976710655 || number2 > 281474976710655) {
            return '#NUM!';
        }

        // Return bitwise AND of two numbers
        return number1 & number2;
    },

    /**
     * Implement BITLSHIFT function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Bitwise Left Shift operator
     * @param {integer} number1 [description]
     * @param {integer} shift   [description]
     */
    BITLSHIFT: function(number, shift) {
        number = parseFloat(number, 10);
        shift  = parseFloat(shift , 10);
        // Return error if either number is a non-numeric value
        if (isNaN(number) || isNaN(shift)) {
            return '#VALUE!';
        }

        // Return error if number is less than 0
        if (number < 0) {
            return '#NUM!';
        }

        // Return error if number is a non-integer
        if (Math.floor(number) !== number) {
            return '#NUM!';
        }

        // Return error if number is greater than (2^48)-1
        if (number > 281474976710655) {
            return '#NUM!';
        }

        // Return error if the absolute value of shift is greater than 53
        if (Math.abs(shift) > 53) {
            return '#NUM!';
        }

        // Return number shifted by shift bits to the left or to the right if shift is negative
        return (shift >= 0) ? number << shift : number >> -shift;
    },

    /**
     * Implement BITOR function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Bitwise OR operator
     * @param {integer} number1 [description]
     * @param {integer} number2 [description]
     */
    BITOR: function(number1, number2) {
        number1 = parseFloat(number1, 10);
        number2 = parseFloat(number2, 10);

        // Return error if either number is a non-numeric value
        if (isNaN(number1) || isNaN(number2)) {
            return '#VALUE!';
        }

        // Return error if either number is less than 0
        if (number1 < 0 || number2 < 0) {
            return '#NUM!';
        }

        // Return error if either number is a non-integer
        if (Math.floor(number1) !== number1 || Math.floor(number2) !== number2) {
            return '#NUM!';
        }

        // Return error if either number is greater than (2^48)-1
        if (number1 > 281474976710655 || number2 > 281474976710655) {
            return '#NUM!';
        }

        // Return bitwise OR of two numbers
        return number1 | number2;
    },

    /**
     * Implement BITRSHIFT function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Bitwise Right Shift operator
     * @param {integer} number1 [description]
     * @param {integer} shift   [description]
     */
    BITRSHIFT : function(number, shift) {
        number = parseFloat(number, 10);
        shift  = parseFloat(shift,  10);

        // Return error if either number is a non-numeric value
        if (isNaN(number) || isNaN(shift)) {
            return '#VALUE!';
        }

        // Return error if number is less than 0
        if (number < 0) {
            return '#NUM!';
        }

        // Return error if number is a non-integer
        if (Math.floor(number) !== number) {
            return '#NUM!';
        }

        // Return error if number is greater than (2^48)-1
        if (number > 281474976710655) {
            return '#NUM!';
        }

        // Return error if the absolute value of shift is greater than 53
        if (Math.abs(shift) > 53) {
            return '#NUM!';
        }

        // Return number shifted by shift bits to the right or to the left if shift is negative
        return (shift >= 0) ? number >> shift : number << -shift;
    },

    /**
     * Implement BITXOR function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Bitwise XOR operator
     * @param {integer} number1 [description]
     * @param {integer} number2 [description]
     */
    BITXOR : function(number1, number2) {
        number1 = parseFloat(number1, 10);
        number2 = parseFloat(number2, 10);

        // Return error if either number is a non-numeric value
        if (isNaN(number1) || isNaN(number2)) {
            return '#VALUE!';
        }

        // Return error if either number is less than 0
        if (number1 < 0 || number2 < 0) {
            return '#NUM!';
        }

        // Return error if either number is a non-integer
        if (Math.floor(number1) !== number1 || Math.floor(number2) !== number2) {
            return '#NUM!';
        }

        // Return error if either number is greater than (2^48)-1
        if (number1 > 281474976710655 || number2 > 281474976710655) {
            return '#NUM!';
        }

        // Return bitwise XOR of two numbers
        return number1 ^ number2;
    },

    COMPLEX: function(real, imaginary, suffix) {
        // Return error if either number is a non-numeric value
        if (isNaN(real) || isNaN(imaginary)) {
            return '#VALUE!';
        }

        // Set suffix
        suffix = (typeof suffix === 'undefined') ? 'i' : suffix;

        // Return error if suffix is neither "i" nor "j"
        if (suffix !== 'i' && suffix !== 'j') {
            return '#VALUE!';
        }

        // Return complex number
        if (real === 0 && imaginary === 0) {
            return 0;
        } else if (real === 0) {
            return (imaginary === 1) ? suffix : imaginary.toString() + suffix;
        } else if (imaginary === 0) {
            return real.toString();
        } else {
            var sign = (imaginary > 0) ? '+' : '';
            return real.toString() + sign + ((imaginary === 1) ? suffix : imaginary.toString() + suffix);
        }
    },

    /**
     * Implement CONVERT function, part of the stoic's formula.js (http://www.stoic.com/pages/formula)
     * Converting value from one measurement unit to another measurement unit
     * @param {int}     number      [value in first unit]
     * @param {string}  from_unit   [source measurement unit]
     * @param {string}  to_unit     [destinaition measurement unit]
     */
    CONVERT: function(number, from_unit, to_unit) {
        // Return error if number is a non-numeric value
        if (isNaN(number)) {
            return '#VALUE!';
        }

        // List of units supported by CONVERT and units defined by the International System of Units
        // [Name, Symbol, Alternate symbols, Quantity, ISU, CONVERT, Conversion ratio]
        var units = [
            ["a.u. of action", "?", null, "action", false, false, 1.05457168181818e-34],
            ["a.u. of charge", "e", null, "electric_charge", false, false, 1.60217653141414e-19],
            ["a.u. of energy", "Eh", null, "energy", false, false, 4.35974417757576e-18],
            ["a.u. of length", "a?", null, "length", false, false, 5.29177210818182e-11],
            ["a.u. of mass", "m?", null, "mass", false, false, 9.10938261616162e-31],
            ["a.u. of time", "?/Eh", null, "time", false, false, 2.41888432650516e-17],
            ["admiralty knot", "admkn", null, "speed", false, true, 0.514773333],
            ["ampere", "A", null, "electric_current", true, false, 1],
            ["ampere per meter", "A/m", null, "magnetic_field_intensity", true, false, 1],
            ["ångström", "Å", ["ang"], "length", false, true, 1e-10],
            ["are", "ar", null, "area", false, true, 100],
            ["astronomical unit", "ua", null, "length", false, false, 1.49597870691667e-11],
            ["bar", "bar", null, "pressure", false, false, 100000],
            ["barn", "b", null, "area", false, false, 1e-28],
            ["becquerel", "Bq", null, "radioactivity", true, false, 1],
            ["bit", "bit", ["b"], "information", false, true, 1],
            ["btu", "BTU", ["btu"], "energy", false, true, 1055.05585262],
            ["byte", "byte", null, "information", false, true, 8],
            ["candela", "cd", null, "luminous_intensity", true, false, 1],
            ["candela per square metre", "cd/m?", null, "luminance", true, false, 1],
            ["coulomb", "C", null, "electric_charge", true, false, 1],
            ["cubic ångström", "ang3", ["ang^3"], "volume", false, true, 1e-30],
            ["cubic foot", "ft3", ["ft^3"], "volume", false, true, 0.028316846592],
            ["cubic inch", "in3", ["in^3"], "volume", false, true, 0.000016387064],
            ["cubic light-year", "ly3", ["ly^3"], "volume", false, true, 8.46786664623715e-47],
            ["cubic metre", "m?", null, "volume", true, true, 1],
            ["cubic mile", "mi3", ["mi^3"], "volume", false, true, 4168181825.44058],
            ["cubic nautical mile", "Nmi3", ["Nmi^3"], "volume", false, true, 6352182208],
            ["cubic Pica", "Pica3", ["Picapt3", "Pica^3", "Picapt^3"], "volume", false, true, 7.58660370370369e-8],
            ["cubic yard", "yd3", ["yd^3"], "volume", false, true, 0.764554857984],
            ["cup", "cup", null, "volume", false, true, 0.0002365882365],
            ["dalton", "Da", ["u"], "mass", false, false, 1.66053886282828e-27],
            ["day", "d", ["day"], "time", false, true, 86400],
            ["degree", "°", null, "angle", false, false, 0.0174532925199433],
            ["degrees Rankine", "Rank", null, "temperature", false, true, 0.555555555555556],
            ["dyne", "dyn", ["dy"], "force", false, true, 0.00001],
            ["electronvolt", "eV", ["ev"], "energy", false, true, 1.60217656514141],
            ["ell", "ell", null, "length", false, true, 1.143],
            ["erg", "erg", ["e"], "energy", false, true, 1e-7],
            ["farad", "F", null, "electric_capacitance", true, false, 1],
            ["fluid ounce", "oz", null, "volume", false, true, 0.0000295735295625],
            ["foot", "ft", null, "length", false, true, 0.3048],
            ["foot-pound", "flb", null, "energy", false, true, 1.3558179483314],
            ["gal", "Gal", null, "acceleration", false, false, 0.01],
            ["gallon", "gal", null, "volume", false, true, 0.003785411784],
            ["gauss", "G", ["ga"], "magnetic_flux_density", false, true, 1],
            ["grain", "grain", null, "mass", false, true, 0.0000647989],
            ["gram", "g", null, "mass", false, true, 0.001],
            ["gray", "Gy", null, "absorbed_dose", true, false, 1],
            ["gross registered ton", "GRT", ["regton"], "volume", false, true, 2.8316846592],
            ["hectare", "ha", null, "area", false, true, 10000],
            ["henry", "H", null, "inductance", true, false, 1],
            ["hertz", "Hz", null, "frequency", true, false, 1],
            ["horsepower", "HP", ["h"], "power", false, true, 745.69987158227],
            ["horsepower-hour", "HPh", ["hh", "hph"], "energy", false, true, 2684519.538],
            ["hour", "h", ["hr"], "time", false, true, 3600],
            ["imperial gallon (U.K.)", "uk_gal", null, "volume", false, true, 0.00454609],
            ["imperial hundredweight", "lcwt", ["uk_cwt", "hweight"], "mass", false, true, 50.802345],
            ["imperial quart (U.K)", "uk_qt", null, "volume", false, true, 0.0011365225],
            ["imperial ton", "brton", ["uk_ton", "LTON"], "mass", false, true, 1016.046909],
            ["inch", "in", null, "length", false, true, 0.0254],
            ["international acre", "uk_acre", null, "area", false, true, 4046.8564224],
            ["IT calorie", "cal", null, "energy", false, true, 4.1868],
            ["joule", "J", null, "energy", true, true, 1],
            ["katal", "kat", null, "catalytic_activity", true, false, 1],
            ["kelvin", "K", ["kel"], "temperature", true, true, 1],
            ["kilogram", "kg", null, "mass", true, true, 1],
            ["knot", "kn", null, "speed", false, true, 0.514444444444444],
            ["light-year", "ly", null, "length", false, true, 9460730472580800],
            ["litre", "L", ["l", "lt"], "volume", false, true, 0.001],
            ["lumen", "lm", null, "luminous_flux", true, false, 1],
            ["lux", "lx", null, "illuminance", true, false, 1],
            ["maxwell", "Mx", null, "magnetic_flux", false, false, 1e-18],
            ["measurement ton", "MTON", null, "volume", false, true, 1.13267386368],
            ["meter per hour", "m/h", ["m/hr"], "speed", false, true, 0.00027777777777778],
            ["meter per second", "m/s", ["m/sec"], "speed", true, true, 1],
            ["meter per second squared", "m?s??", null, "acceleration", true, false, 1],
            ["parsec", "pc", ["parsec"], "length", false, true, 30856775814671900],
            ["meter squared per second", "m?/s", null, "kinematic_viscosity", true, false, 1],
            ["metre", "m", null, "length", true, true, 1],
            ["miles per hour", "mph", null, "speed", false, true, 0.44704],
            ["millimetre of mercury", "mmHg", null, "pressure", false, false, 133.322],
            ["minute", "?", null, "angle", false, false, 0.000290888208665722],
            ["minute", "min", ["mn"], "time", false, true, 60],
            ["modern teaspoon", "tspm", null, "volume", false, true, 0.000005],
            ["mole", "mol", null, "amount_of_substance", true, false, 1],
            ["morgen", "Morgen", null, "area", false, true, 2500],
            ["n.u. of action", "?", null, "action", false, false, 1.05457168181818e-34],
            ["n.u. of mass", "m?", null, "mass", false, false, 9.10938261616162e-31],
            ["n.u. of speed", "c?", null, "speed", false, false, 299792458],
            ["n.u. of time", "?/(me?c??)", null, "time", false, false, 1.28808866778687e-21],
            ["nautical mile", "M", ["Nmi"], "length", false, true, 1852],
            ["newton", "N", null, "force", true, true, 1],
            ["œrsted", "Oe ", null, "magnetic_field_intensity", false, false, 79.5774715459477],
            ["ohm", "Ω", null, "electric_resistance", true, false, 1],
            ["ounce mass", "ozm", null, "mass", false, true, 0.028349523125],
            ["pascal", "Pa", null, "pressure", true, false, 1],
            ["pascal second", "Pa?s", null, "dynamic_viscosity", true, false, 1],
            ["pferdestärke", "PS", null, "power", false, true, 735.49875],
            ["phot", "ph", null, "illuminance", false, false, 0.0001],
            ["pica (1/6 inch)", "pica", null, "length", false, true, 0.00035277777777778],
            ["pica (1/72 inch)", "Pica", ["Picapt"], "length", false, true, 0.00423333333333333],
            ["poise", "P", null, "dynamic_viscosity", false, false, 0.1],
            ["pond", "pond", null, "force", false, true, 0.00980665],
            ["pound force", "lbf", null, "force", false, true, 4.4482216152605],
            ["pound mass", "lbm", null, "mass", false, true, 0.45359237],
            ["quart", "qt", null, "volume", false, true, 0.000946352946],
            ["radian", "rad", null, "angle", true, false, 1],
            ["second", "?", null, "angle", false, false, 0.00000484813681109536],
            ["second", "s", ["sec"], "time", true, true, 1],
            ["short hundredweight", "cwt", ["shweight"], "mass", false, true, 45.359237],
            ["siemens", "S", null, "electrical_conductance", true, false, 1],
            ["sievert", "Sv", null, "equivalent_dose", true, false, 1],
            ["slug", "sg", null, "mass", false, true, 14.59390294],
            ["square ångström", "ang2", ["ang^2"], "area", false, true, 1e-20],
            ["square foot", "ft2", ["ft^2"], "area", false, true, 0.09290304],
            ["square inch", "in2", ["in^2"], "area", false, true, 0.00064516],
            ["square light-year", "ly2", ["ly^2"], "area", false, true, 8.95054210748189e+31],
            ["square meter", "m?", null, "area", true, true, 1],
            ["square mile", "mi2", ["mi^2"], "area", false, true, 2589988.110336],
            ["square nautical mile", "Nmi2", ["Nmi^2"], "area", false, true, 3429904],
            ["square Pica", "Pica2", ["Picapt2", "Pica^2", "Picapt^2"], "area", false, true, 0.00001792111111111],
            ["square yard", "yd2", ["yd^2"], "area", false, true, 0.83612736],
            ["statute mile", "mi", null, "length", false, true, 1609.344],
            ["steradian", "sr", null, "solid_angle", true, false, 1],
            ["stilb", "sb", null, "luminance", false, false, 0.0001],
            ["stokes", "St", null, "kinematic_viscosity", false, false, 0.0001],
            ["stone", "stone", null, "mass", false, true, 6.35029318],
            ["tablespoon", "tbs", null, "volume", false, true, 0.0000147868],
            ["teaspoon", "tsp", null, "volume", false, true, 0.00000492892],
            ["tesla", "T", null, "magnetic_flux_density", true, true, 1],
            ["thermodynamic calorie", "c", null, "energy", false, true, 4.184],
            ["ton", "ton", null, "mass", false, true, 907.18474],
            ["tonne", "t", null, "mass", false, false, 1000],
            ["U.K. pint", "uk_pt", null, "volume", false, true, 0.00056826125],
            ["U.S. bushel", "bushel", null, "volume", false, true, 0.03523907],
            ["U.S. oil barrel", "barrel", null, "volume", false, true, 0.158987295],
            ["U.S. pint", "pt", ["us_pt"], "volume", false, true, 0.000473176473],
            ["U.S. survey mile", "survey_mi", null, "length", false, true, 1609.347219],
            ["U.S. survey/statute acre", "us_acre", null, "area", false, true, 4046.87261],
            ["volt", "V", null, "voltage", true, false, 1],
            ["watt", "W", null, "power", true, true, 1],
            ["watt-hour", "Wh", ["wh"], "energy", false, true, 3600],
            ["weber", "Wb", null, "magnetic_flux", true, false, 1],
            ["yard", "yd", null, "length", false, true, 0.9144],
            ["year", "yr", null, "time", false, true, 31557600]
        ];

        // Binary prefixes
        // [Name, Prefix power of 2 value, Previx value, Abbreviation, Derived from]
        var binary_prefixes = {
            Yi: ["yobi", 80, 1208925819614629174706176, "Yi", "yotta"],
            Zi: ["zebi", 70, 1180591620717411303424, "Zi", "zetta"],
            Ei: ["exbi", 60, 1152921504606846976, "Ei", "exa"],
            Pi: ["pebi", 50, 1125899906842624, "Pi", "peta"],
            Ti: ["tebi", 40, 1099511627776, "Ti", "tera"],
            Gi: ["gibi", 30, 1073741824, "Gi", "giga"],
            Mi: ["mebi", 20, 1048576, "Mi", "mega"],
            ki: ["kibi", 10, 1024, "ki", "kilo"]
        };

        // Unit prefixes
        // [Name, Multiplier, Abbreviation]
        var unit_prefixes = {
            Y: ["yotta", 1e+24, "Y"],
            Z: ["zetta", 1e+21, "Z"],
            E: ["exa", 1e+18, "E"],
            P: ["peta", 1e+15, "P"],
            T: ["tera", 1e+12, "T"],
            G: ["giga", 1e+09, "G"],
            M: ["mega", 1e+06, "M"],
            k: ["kilo", 1e+03, "k"],
            h: ["hecto", 1e+02, "h"],
            e: ["dekao", 1e+01, "e"],
            d: ["deci", 1e-01, "d"],
            c: ["centi", 1e-02, "c"],
            m: ["milli", 1e-03, "m"],
            u: ["micro", 1e-06, "u"],
            n: ["nano", 1e-09, "n"],
            p: ["pico", 1e-12, "p"],
            f: ["femto", 1e-15, "f"],
            a: ["atto", 1e-18, "a"],
            z: ["zepto", 1e-21, "z"],
            y: ["yocto", 1e-24, "y"]
        };

        // Initialize units and multipliers
        var from = null;
        var to = null;
        var base_from_unit = from_unit;
        var base_to_unit = to_unit;
        var from_multiplier = 1;
        var to_multiplier = 1;
        var alt;

        // Lookup from and to units
        for (var i = 0; i < units.length; i++) {
            alt = (units[i][2] === null) ? [] : units[i][2];
            if (units[i][1] === base_from_unit || alt.indexOf(base_from_unit) >= 0) {
                from = units[i];
            }
            if (units[i][1] === base_to_unit || alt.indexOf(base_to_unit) >= 0) {
                to = units[i];
            }
        }

        // Lookup from prefix
        if (from === null) {
            var from_binary_prefix = binary_prefixes[from_unit.substring(0, 2)];
            var from_unit_prefix = unit_prefixes[from_unit.substring(0, 1)];

            // Handle dekao unit prefix (only unit prefix with two characters)
            if (from_unit.substring(0, 2) === 'da') {
                from_unit_prefix = ["dekao", 1e+01, "da"];
            }

            // Handle binary prefixes first (so that 'Yi' is processed before 'Y')
            if (from_binary_prefix) {
                from_multiplier = from_binary_prefix[2];
                base_from_unit = from_unit.substring(2);
            } else if (from_unit_prefix) {
                from_multiplier = from_unit_prefix[1];
                base_from_unit = from_unit.substring(from_unit_prefix[2].length);
            }

            // Lookup from unit
            for (var j = 0; j < units.length; j++) {
                alt = (units[j][2] === null) ? [] : units[j][2];
                if (units[j][1] === base_from_unit || alt.indexOf(base_from_unit) >= 0) {
                    from = units[j];
                }
            }
        }

        // Lookup to prefix
        if (to === null) {
            var to_binary_prefix = binary_prefixes[to_unit.substring(0, 2)];
            var to_unit_prefix = unit_prefixes[to_unit.substring(0, 1)];

            // Handle dekao unit prefix (only unit prefix with two characters)
            if (to_unit.substring(0, 2) === 'da') {
                to_unit_prefix = ["dekao", 1e+01, "da"];
            }

            // Handle binary prefixes first (so that 'Yi' is processed before 'Y')
            if (to_binary_prefix) {
                to_multiplier = to_binary_prefix[2];
                base_to_unit = to_unit.substring(2);
            } else if (to_unit_prefix) {
                to_multiplier = to_unit_prefix[1];
                base_to_unit = to_unit.substring(to_unit_prefix[2].length);
            }

            // Lookup to unit
            for (var k = 0; k < units.length; k++) {
                alt = (units[k][2] === null) ? [] : units[k][2];
                if (units[k][1] === base_to_unit || alt.indexOf(base_to_unit) >= 0) {
                    to = units[k];
                }
            }
        }

        // Return error if a unit does not exist
        if (from === null || to === null) {
            return '#N/A';
        }

        // Return error if units represent different quantities
        if (from[3] !== to[3]) {
            return '#N/A';
        }

        // Return converted number
        return number * from[6] * from_multiplier / (to[6] * to_multiplier);
    },

    DEC2BIN : function(number, places) {
        // Return error if number is not a number
        if (isNaN(number)) {
            return '#VALUE!';
        }

        // Return error if number is not decimal, is lower than -512, or is greater than 511
        if (!/^-?[0-9]{1,3}$/.test(number) || number < -512 || number > 511) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character binary number if number is negative
        if (number < 0) {
            return '1' + utility.repeat('0', 9 - (512 + number).toString(2).length) + (512 + number).toString(2);
        }

        // Convert decimal number to binary
        var result = parseInt(number, 10).toString(2);

        // Return binary number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    DEC2HEX : function(number, places) {
        // Return error if number is not a number
        if (isNaN(number)) {
            return '#VALUE!';
        }

        // Return error if number is not decimal, is lower than -549755813888, or is greater than 549755813887
        if (!/^-?[0-9]{1,12}$/.test(number) || number < -549755813888 || number > 549755813887) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character hexadecimal number if number is negative
        if (number < 0) {
            return (1099511627776 + number).toString(16);
        }

        // Convert decimal number to hexadecimal
        var result = parseInt(number, 10).toString(16);

        // Return hexadecimal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    DEC2OCT : function(number, places) {
        // Return error if number is not a number
        if (isNaN(number)) {
            return '#VALUE!';
        }

        // Return error if number is not decimal, is lower than -549755813888, or is greater than 549755813887
        if (!/^-?[0-9]{1,9}$/.test(number) || number < -536870912 || number > 536870911) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character octal number if number is negative
        if (number < 0) {
            return (1073741824 + number).toString(8);
        }

        // Convert decimal number to octal
        var result = parseInt(number, 10).toString(8);

        // Return octal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    DELTA : function(number1, number2) {
        // Set number2 to zero if undefined
        number2 = (typeof number2 === 'undefined') ? 0 : number2;

        // Return error if either number is not a number
        if (isNaN(number1) || isNaN(number2)) {
            return '#VALUE!';
        }

        // Return delta
        return (number1 === number2) ? 1 : 0;
    },

    ERF : function(lower_bound, upper_bound) {
        // Set number2 to zero if undefined
        upper_bound = (typeof upper_bound === 'undefined') ? 0 : upper_bound;

        // Return error if either number is not a number
        if (isNaN(lower_bound) || isNaN(upper_bound)) {
            return '#VALUE!';
        }

        // Return ERFC using jStat [http://www.jstat.org/]
        return jStat.erf(lower_bound);
    },

    ERFC : function(x) {
        // Return error if x is not a number
        if (isNaN(x)) {
            return '#VALUE!';
        }

        // Return ERFC using jStat [http://www.jstat.org/]
        return jStat.erfc(x);
    },

    ERFCPRECISE : function() {
        return;
    },

    ERFPRECISE : function() {
        return;
    },

    GESTEP : function(number, step) {
        // Set step to zero if undefined
        step = (typeof step === 'undefined') ? 0 : step;

        // Return error if either number is not a number
        if (isNaN(number) || isNaN(step)) {
            return '#VALUE!';
        }

        // Return delta
        return (number >= step) ? 1 : 0;
    },

    HEX2BIN : function(number, places) {

        // Return error if number is not hexadecimal or contains more than ten characters (10 digits)
        if (!/^[0-9A-Fa-f]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Check if number is negative
        var negative = (number.length === 10 && number.substring(0, 1).toLowerCase() === 'f') ? true : false;

        // Convert hexadecimal number to decimal
        var decimal = (negative) ? parseInt(number, 16) - 1099511627776 : parseInt(number, 16);

        // Return error if number is lower than -512 or greater than 511
        if (decimal < -512 || decimal > 511) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character binary number if number is negative
        if (negative) {
            return '1' + utility.repeat('0', 9 - (512 + decimal).toString(2).length) + (512 + decimal).toString(2);
        }

        // Convert decimal number to binary
        var result = decimal.toString(2);

        // Return binary number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    HEX2DEC : function(number) {
        // Return error if number is not hexadecimal or contains more than ten characters (10 digits)
        if (!/^[0-9A-Fa-f]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Convert hexadecimal number to decimal
        var decimal = parseInt(number, 16);

        // Return decimal number
        return (decimal >= 549755813888) ? decimal - 1099511627776 : decimal;
    },

    HEX2OCT : function(number, places) {
        // Return error if number is not hexadecimal or contains more than ten characters (10 digits)
        if (!/^[0-9A-Fa-f]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Convert hexadecimal number to decimal
        var decimal = parseInt(number, 16);

        // Return error if number is positive and greater than 0x1fffffff (536870911)
        if (decimal > 536870911 && decimal < 1098974756864) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character octal number if number is negative
        if (decimal >= 1098974756864) {
            return (decimal - 1098437885952).toString(8);
        }

        // Convert decimal number to octal
        var result = decimal.toString(8);

        // Return octal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    IMABS : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return absolute value of complex number
        return Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
    },

    IMAGINARY : function(inumber) {
        // Return 0 if inumber is equal to 0
        if (inumber === 0 || inumber === '0') {
            return 0;
        }

        // Handle special cases
        if (['i', 'j'].indexOf(inumber) >= 0) {
            return 1;
        }

        // Normalize imaginary coefficient
        inumber = inumber.replace('+i', '+1i').replace('-i', '-1i').replace('+j', '+1j').replace('-j', '-1j');

        // Lookup sign
        var plus = inumber.indexOf('+');
        var minus = inumber.indexOf('-');
        if (plus === 0) {
            plus = inumber.indexOf('+', 1);
        }

        if (minus === 0) {
            minus = inumber.indexOf('-', 1);
        }

        // Lookup imaginary unit
        var last = inumber.substring(inumber.length - 1, inumber.length);
        var unit = (last === 'i' || last === 'j');

        if (plus >= 0 || minus >= 0) {
            // Return error if imaginary unit is neither i nor j
            if (!unit) {
                return '#NUM!';
            }

            // Return imaginary coefficient of complex number
            if (plus >= 0) {
                return (isNaN(inumber.substring(0, plus)) || isNaN(inumber.substring(plus + 1, inumber.length - 1))) ?
                    '#NUM!' :
                    Number(inumber.substring(plus + 1, inumber.length - 1));
            } else {
                return (isNaN(inumber.substring(0, minus)) || isNaN(inumber.substring(minus + 1, inumber.length - 1))) ?
                    '#NUM!' :
                    -Number(inumber.substring(minus + 1, inumber.length - 1));
            }
        } else {
            if (unit) {
                return (isNaN(inumber.substring(0, inumber.length - 1))) ? '#NUM!' : inumber.substring(0, inumber.length - 1);
            } else {
                return (isNaN(inumber)) ? '#NUM!' : 0;
            }
        }
    },

    IMARGUMENT : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return error if inumber is equal to zero
        if (x === 0 && y === 0) {
            return '#DIV/0!';
        }

        // Return PI/2 if x is equal to zero and y is positive
        if (x === 0 && y > 0) {
            return Math.PI / 2;
        }

        // Return -PI/2 if x is equal to zero and y is negative
        if (x === 0 && y < 0) {
            return -Math.PI / 2;
        }

        // Return zero if x is negative and y is equal to zero
        if (y === 0 && x > 0) {
            return 0;
        }

        // Return zero if x is negative and y is equal to zero
        if (y === 0 && x < 0) {
            return -Math.PI;
        }

        // Return argument of complex number
        if (x > 0) {
            return Math.atan(y / x);
        } else if (x < 0 && y >= 0) {
            return Math.atan(y / x) + Math.PI;
        } else {
            return Math.atan(y / x) - Math.PI;
        }
    },

    IMCONJUGATE : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return conjugate of complex number
        return (y !== 0) ? formula.engineering.COMPLEX(x, -y, unit) : inumber;
    },

    IMCOS : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return cosine of complex number
        return formula.engineering.COMPLEX(Math.cos(x) * (Math.exp(y) + Math.exp(-y)) / 2, -Math.sin(x) * (Math.exp(y) - Math.exp(-y)) / 2, unit);
    },

    IMCOSH : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return hyperbolic cosine of complex number
        return formula.engineering.COMPLEX(Math.cos(y) * (Math.exp(x) + Math.exp(-x)) / 2, Math.sin(y) * (Math.exp(x) - Math.exp(-x)) / 2, unit);
    },

    IMCOT : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return cotangent of complex number
        return formula.engineering.IMDIV(formula.engineering.IMCOS(inumber), formula.engineering.IMSIN(inumber));
    },

    IMCSC : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return cosecant of complex number
        return formula.engineering.IMDIV('1', formula.engineering.IMSIN(inumber));
    },

    IMCSCH : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return hyperbolic cosecant of complex number
        return formula.engineering.IMDIV('1', formula.engineering.IMSINH(inumber));
    },

    IMDIV : function(inumber1, inumber2) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var a = formula.engineering.IMREAL(inumber1);
        var b = formula.engineering.IMAGINARY(inumber1);
        var c = formula.engineering.IMREAL(inumber2);
        var d = formula.engineering.IMAGINARY(inumber2);

        // Lookup imaginary unit
        var unit1 = inumber1.substring(inumber1.length - 1);
        var unit2 = inumber1.substring(inumber1.length - 1);
        var unit = 'i';
        if (unit1 === 'j') {
            unit = 'j';
        } else if (unit2 === 'j') {
            unit = 'j';
        }

        // Return error if either coefficient is not a number
        if (a === '#NUM!' || b === '#NUM!' || c === '#NUM!' || d === '#NUM!') {
            return '#NUM!';
        }

        // Return error if inumber2 is null
        if (c === 0 && d === 0) {
            return '#NUM!';
        }

        // Return exponential of complex number
        var den = c * c + d * d;
        return formula.engineering.COMPLEX((a * c + b * d) / den, (b * c - a * d) / den, unit);
    },

    IMEXP : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return exponential of complex number
        var e = Math.exp(x);
        return formula.engineering.COMPLEX(e * Math.cos(y), e * Math.sin(y), unit);
    },

    IMLN : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return exponential of complex number
        return formula.engineering.COMPLEX(Math.log(Math.sqrt(x * x + y * y)), Math.atan(y / x), unit);
    },

    IMLOG10 : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return exponential of complex number
        return formula.engineering.COMPLEX(Math.log(Math.sqrt(x * x + y * y)) / Math.log(10), Math.atan(y / x) / Math.log(10), unit);
    },

    IMLOG2 : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return exponential of complex number
        return formula.engineering.COMPLEX(Math.log(Math.sqrt(x * x + y * y)) / Math.log(2), Math.atan(y / x) / Math.log(2), unit);
    },

    IMPOWER : function(inumber, number) {
        // Return error if number is nonnumeric
        if (isNaN(number)) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Calculate power of modulus
        var p = Math.pow(formula.engineering.IMABS(inumber), number);

        // Calculate argument
        var t = formula.engineering.IMARGUMENT(inumber);

        // Return exponential of complex number
        return formula.engineering.COMPLEX(p * Math.cos(number * t), p * Math.sin(number * t), unit);
    },

    IMPRODUCT : function() {
        // Initialize result
        var result = arguments[0];

        // Loop on all numbers
        for (var i = 1; i < arguments.length; i++) {
            // Lookup coefficients of two complex numbers
            var a = formula.engineering.IMREAL(result);
            var b = formula.engineering.IMAGINARY(result);
            var c = formula.engineering.IMREAL(arguments[i]);
            var d = formula.engineering.IMAGINARY(arguments[i]);

            // Return error if either coefficient is not a number
            if (a === '#NUM!' || b === '#NUM!' || c === '#NUM!' || d === '#NUM!') {
                return '#NUM!';
            }

            // Complute product of two complex numbers
            result = formula.engineering.COMPLEX(a * c - b * d, a * d + b * c);
        }

        // Return product of complex numbers
        return result;
    },

    IMREAL : function(inumber) {
        // Return 0 if inumber is equal to 0
        if (inumber === 0 || inumber === '0') {
            return 0;
        }

        // Handle special cases
        if (['i', '+i', '1i', '+1i', '-i', '-1i', 'j', '+j', '1j', '+1j', '-j', '-1j'].indexOf(inumber) >= 0) {
            return 0;
        }

        // Lookup sign
        var plus = inumber.indexOf('+');
        var minus = inumber.indexOf('-');
        if (plus === 0) {
            plus = inumber.indexOf('+', 1);
        }
        if (minus === 0) {
            minus = inumber.indexOf('-', 1);
        }

        // Lookup imaginary unit
        var last = inumber.substring(inumber.length - 1, inumber.length);
        var unit = (last === 'i' || last === 'j');

        if (plus >= 0 || minus >= 0) {
            // Return error if imaginary unit is neither i nor j
            if (!unit) {
                return '#NUM!';
            }

            // Return real coefficient of complex number
            if (plus >= 0) {
                return (isNaN(inumber.substring(0, plus)) || isNaN(inumber.substring(plus + 1, inumber.length - 1))) ?
                    '#NUM!' :
                    Number(inumber.substring(0, plus));
            } else {
                return (isNaN(inumber.substring(0, minus)) || isNaN(inumber.substring(minus + 1, inumber.length - 1))) ?
                    '#NUM!' :
                    Number(inumber.substring(0, minus));
            }
        } else {
            if (unit) {
                return (isNaN(inumber.substring(0, inumber.length - 1))) ? '#NUM!' : 0;
            } else {
                return (isNaN(inumber)) ? '#NUM!' : inumber;
            }
        }
    },

    IMSEC : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return secant of complex number
        return formula.engineering.IMDIV('1', formula.engineering.IMCOS(inumber));
    },

    IMSECH : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return hyperbolic secant of complex number
        return formula.engineering.IMDIV('1', formula.engineering.IMCOSH(inumber));
    },

    IMSIN : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return sine of complex number
        return formula.engineering.COMPLEX(Math.sin(x) * (Math.exp(y) + Math.exp(-y)) / 2, Math.cos(x) * (Math.exp(y) - Math.exp(-y)) / 2, unit);
    },

    IMSINH : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return hyperbolic sine of complex number
        return formula.engineering.COMPLEX(Math.cos(y) * (Math.exp(x) - Math.exp(-x)) / 2, Math.sin(y) * (Math.exp(x) + Math.exp(-x)) / 2, unit);
    },

    IMSQRT : function(inumber) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Lookup imaginary unit
        var unit = inumber.substring(inumber.length - 1);
        unit = (unit === 'i' || unit === 'j') ? unit : 'i';

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Calculate power of modulus
        var s = Math.sqrt(formula.engineering.IMABS(inumber));

        // Calculate argument
        var t = formula.engineering.IMARGUMENT(inumber);

        // Return exponential of complex number
        return formula.engineering.COMPLEX(s * Math.cos(t / 2), s * Math.sin(t / 2), unit);
    },

    IMSUB : function(inumber1, inumber2) {
        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var a = formula.engineering.IMREAL(inumber1);
        var b = formula.engineering.IMAGINARY(inumber1);
        var c = formula.engineering.IMREAL(inumber2);
        var d = formula.engineering.IMAGINARY(inumber2);

        // Lookup imaginary unit
        var unit1 = inumber1.substring(inumber1.length - 1);
        var unit2 = inumber1.substring(inumber1.length - 1);
        var unit = 'i';
        if (unit1 === 'j') {
            unit = 'j';
        } else if (unit2 === 'j') {
            unit = 'j';
        }

        // Return error if either coefficient is not a number
        if (a === '#NUM!' || b === '#NUM!' || c === '#NUM!' || d === '#NUM!') {
            return '#NUM!';
        }

        // Return _ of two complex numbers
        return formula.engineering.COMPLEX(a - c, b - d, unit);
    },

    IMSUM : function() {
        // Initialize result
        var result = arguments[0];

        // Loop on all numbers
        for (var i = 1; i < arguments.length; i++) {
            // Lookup coefficients of two complex numbers
            var a = formula.engineering.IMREAL(result);
            var b = formula.engineering.IMAGINARY(result);
            var c = formula.engineering.IMREAL(arguments[i]);
            var d = formula.engineering.IMAGINARY(arguments[i]);

            // Return error if either coefficient is not a number
            if (a === '#NUM!' || b === '#NUM!' || c === '#NUM!' || d === '#NUM!') {
                return '#NUM!';
            }

            // Complute product of two complex numbers
            result = formula.engineering.COMPLEX(a + c, b + d);
        }

        // Return sum of complex numbers
        return result;
    },

    IMTAN : function(inumber) {
        // Return error if inumber is a logical value
        if (inumber === true || inumber === false) {
            return '#VALUE!';
        }

        // Lookup real and imaginary coefficients using Formula.js [http://formulajs.org]
        var x = formula.engineering.IMREAL(inumber);
        var y = formula.engineering.IMAGINARY(inumber);

        // Return error if either coefficient is not a number
        if (x === '#NUM!' || y === '#NUM!') {
            return '#NUM!';
        }

        // Return tangent of complex number
        return formula.engineering.IMDIV(formula.engineering.IMSIN(inumber), formula.engineering.IMCOS(inumber));
    },

    OCT2BIN : function(number, places) {
        // Return error if number is not hexadecimal or contains more than ten characters (10 digits)
        if (!/^[0-7]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Check if number is negative
        var negative = (number.length === 10 && number.substring(0, 1) === '7') ? true : false;

        // Convert octal number to decimal
        var decimal = (negative) ? parseInt(number, 8) - 1073741824 : parseInt(number, 8);

        // Return error if number is lower than -512 or greater than 511
        if (decimal < -512 || decimal > 511) {
            return '#NUM!';
        }

        // Ignore places and return a 10-character binary number if number is negative
        if (negative) {
            return '1' + utility.repeat('0', 9 - (512 + decimal).toString(2).length) + (512 + decimal).toString(2);
        }

        // Convert decimal number to binary
        var result = decimal.toString(2);

        // Return binary number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    },

    OCT2DEC : function(number) {
        // Return error if number is not octal or contains more than ten characters (10 digits)
        if (!/^[0-7]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Convert octal number to decimal
        var decimal = parseInt(number, 8);

        // Return decimal number
        return (decimal >= 536870912) ? decimal - 1073741824 : decimal;
    },

    OCT2HEX : function(number, places) {
        // Return error if number is not octal or contains more than ten characters (10 digits)
        if (!/^[0-7]{1,10}$/.test(number)) {
            return '#NUM!';
        }

        // Convert octal number to decimal
        var decimal = parseInt(number, 8);

        // Ignore places and return a 10-character octal number if number is negative
        if (decimal >= 536870912) {
            return 'ff' + (decimal + 3221225472).toString(16);
        }

        // Convert decimal number to hexadecimal
        var result = decimal.toString(16);

        // Return hexadecimal number using the minimum number of characters necessary if places is undefined
        if (typeof places === 'undefined') {
            return result;
        } else {
            // Return error if places is nonnumeric
            if (isNaN(places)) {
                return '#VALUE!';
            }

            // Return error if places is negative
            if (places < 0) {
                return '#NUM!';
            }

            // Truncate places in case it is not an integer
            places = Math.floor(places);

            // Pad return value with leading 0s (zeros) if necessary (using Underscore.string)
            return (places >= result.length) ? utility.repeat('0', places - result.length) + result : '#NUM!';
        }
    }
},
    user_defined : {

}};var utility = {
    /**
     * translate numeric to alphabet
     * @param  {integer} num    numeric value translated to alphabet
     * @return {string}         alphabet representation of the value
     */
    toChr: function(num) {
        var s = "";
        num = num - 1;
        while (num >= 0) {
            s = String.fromCharCode(num % 26 + 97) + s;
            num = Math.floor(num / 26) - 1;
        }
        return s.toUpperCase();
    },

    /**
     * translate alphabet to numeric, A => 1, B => 2, Z => 26, AA => 27 etc
     * @param  {string} chr     Alphabet [A-Z]
     * @return {integer}        Integer representation of the alphabet
     */
    toNum: function(chr) {
        chr = chr.split('');
        var base = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split(''),
            i, j, result = 0;

        for (i = 0, j = chr.length - 1; i < chr.length; i += 1, j -= 1) {
            result += Math.pow(base.length, j) * (base.indexOf(chr[i]) + 1);
        }
        return result;
    },

    /**
     * translate cellStart:cellStop to array containing all cell in range
     * e.g A1:B3 => [A1, A2, A3, B1, B2, B3]
     * @return {array} array containing all address in range
     */
    cellRange: function(addressStart, addressStop) {
        var alpha = /[A-Z]+/,
            num = /[0-9]+/,
            cellStart = addressStart.toUpperCase(),
            cellStop = addressStop.toUpperCase(),
            alphaAxisStart = this.toNum(cellStart.match(alpha)[0]),
            alphaAxisStop = this.toNum(cellStop.match(alpha)[0]),
            numAxisStart = parseInt(cellStart.match(num)[0], 10),
            numAxisStop = parseInt(cellStop.match(num)[0], 10),
            cellRange = [],
            cellAddress,
            row,
            col;

        if(alphaAxisStart < alphaAxisStop){
            for (col = alphaAxisStart; col <= alphaAxisStop; col++) {
                if(numAxisStart < numAxisStop){
                    for (row = numAxisStart; row <= numAxisStop; row++) {
                        cellAddress = this.toChr(col) + row;
                        cellRange.push(cellAddress);
                    }
                }else{
                    for (row = numAxisStart; row >= numAxisStop; row--) {
                        cellAddress = this.toChr(col) + row;
                        cellRange.push(cellAddress);
                    }
                }
            }
        }else{
            for (col = alphaAxisStart; col >= alphaAxisStop; col--) {
                if(numAxisStart < numAxisStop){
                    for (row = numAxisStart; row <= numAxisStop; row++) {
                        cellAddress = this.toChr(col) + row;
                        cellRange.push(cellAddress);
                    }
                }else{
                    for (row = numAxisStart; row >= numAxisStop; row--) {
                        cellAddress = this.toChr(col) + row;
                        cellRange.push(cellAddress);
                    }
                }
            }
        }

        return cellRange;
    },

    /**
     * taken from Formula.VALIDBIN of stoic's formula.js (http://www.stoic.com/pages/formula)
     * check if number is in valid binary format
     * @param  {string}  number [the binary number]
     * @return {Boolean}        [true if valid, false if invalid]
     */
    isValidBinary: function(number) {
        return (/^[01]{1,10}$/).test(number);
    },

    /**
     * String repeater, taken from underscore string (https://github.com/epeli/underscore.string)
     * @param  {[type]} str [description]
     * @param  {[type]} qty [description]
     * @return {[type]}     [description]
     */
    strRepeat: function(str, qty) {
        if (qty < 1) return '';
        var result = '';
        while (qty > 0) {
            if (qty & 1) result += str;
            qty >>= 1, str += str;
        }
        return result;
    },

    repeat: function(str, qty, separator) {
        if (str == null) {
            return '';
        }

        qty = ~~qty;

        // using faster implementation if separator is not needed;
        if (separator == null) {
            return this.strRepeat(String(str), qty);
        }

        // this one is about 300x slower in Google Chrome
        for (var repeat = []; qty > 0; repeat[--qty] = str) {}
        return repeat.join(separator);
    },

    unique: function(array) {
        return array.reduce(function(p, c) {
            if (p.indexOf(c) < 0) p.push(c);
            return p;
        }, []);
    },

    initial : function(array, n, guard) {
        return Array.prototype.slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));
    },

    rest : function(array, n, guard) {
        return Array.prototype.slice.call(array, n == null || guard ? 1 : n);
    },

    /** end of underscore func */

    arrayMerge: function(args) {
        var a, i, result = [];
        for (i = 0; i < args.length; i++) {
            if (typeof(args[i]) == 'object') {
                for (a in args[i]) {
                    if($.trim(args[i][a]) !== ''){
                        result = result.concat(args[i][a]);
                    }
                }
            } else {
                if($.trim(result.concat(args[i])) !== ''){
                    result = result.concat(args[i]);
                }
            }
        }
        return result;
    },

    toArray: function(args) {
        return Array.prototype.slice.call(args, 0);
    },

    /**
     * Converting object into plain array
     * @param  {object} obj Object need to be converted
     * @return {array}      Plain array
     */
    objectToArray: function(obj){
        var ar = [], a;

        for(a in obj){
            ar.push(obj[a]);
        }

        return ar;
    },

    /**
     * remove empty cell from cell range collection
     * @param  {object} cellRange
     * @return {object} trimmed cellRange
     */
    trimEmptyCell : function(cellRange){
        var result = {};

        for(var a in cellRange){
            if($.trim(cellRange[a]) !== ''){
                result[a] = cellRange[a];
            }
        }

        return result;
    },

    cleanFloat: function(number) {
        var power = Math.pow(10, 14);
        return Math.round(number * power) / power;
    },

    countIn: function(range, value) {
        var result = 0;
        for (var i = 0; i < range.length; i++) {
            if (range[i] === value) {
                result++;
            }
        }
        return result;
    },

    /**
     * convert range {A1: val1, A2: val2, B1: val3, B2: val4} into 2 dimensional table array
     * [
     *     [val1, val2],
     *     [val3, val4]
     * ]
     *
     * @param  {object} cellRange [description]
     * @return {array}            [description]
     */
    rangeToTable : function(cellRange){
        var cell, col,
            row = 0,
            alphaPattern = /[A-Z]+/,
            numPattern = /[0-9]+/,
            arrayTable = [],
            resultTable = [];

        for(cell in cellRange){

            col = this.toNum(cell.match(alphaPattern)[0])-1;
            row = parseInt(cell.match(numPattern)[0], 10)-1;

            if(typeof arrayTable[row] == 'undefined'){
                arrayTable[row] = [];
            }

            arrayTable[row][col] = cellRange[cell];
        }

        var resultRow = 0, rowLength = arrayTable.length, colLength;
        for (row = 0; row < rowLength; row++){
            if(typeof(arrayTable[row]) != 'undefined'){
                colLength = arrayTable[row].length;

                if(typeof(resultTable[resultRow]) == 'undefined'){
                    resultTable[resultRow] = [];
                }

                for(col = 0; col < colLength; col++ ){
                    if(typeof(arrayTable[row][col]) != 'undefined'){
                        resultTable[resultRow].push(arrayTable[row][col]);
                    }
                }

                resultRow++;
            }
        }

        return resultTable;
    },

    /**
     * transpose horizontal table to be vertical table, or vice-versa
     * e.g
     *     [[1,2,3,4],
     *      [1,2,3,4]]
     *
     * to be
     *     [[1,1],
     *      [2,2],
     *      [3,3],
     *      [4,4]]
     */
    transposeTable : function(table){
        var row, col, rowLength, colLength, newTable;

        rowLength = table.length;
        newTable  = [];

        for(row = 0; row < rowLength; row++){
            colLength = table[row].length;

            for(col = 0; col < colLength; col++){
                if(typeof(newTable[col]) == 'undefined'){
                    newTable[col] = [];
                }

                newTable[col].push(table[row][col]);
            }
        }

        return newTable;

    }
};var data = {
    MEMOIZED_FACT : [],

    SQRT2PI : 2.5066282746310002,

    WEEK_STARTS : [
      undefined,
      0,
      1,
      undefined,
      undefined,
      undefined,
      undefined,
      undefined,
      undefined,
      undefined,
      undefined,
      undefined,
      1,
      2,
      3,
      4,
      5,
      6,
      0
    ],

    WEEK_TYPES : [
      [],
      [1, 2, 3, 4, 5, 6, 7],
      [7, 1, 2, 3, 4, 5, 6],
      [6, 0, 1, 2, 3, 4, 5],
      [],
      [],
      [],
      [],
      [],
      [],
      [],
      [7, 1, 2, 3, 4, 5, 6],
      [6, 7, 1, 2, 3, 4, 5],
      [5, 6, 7, 1, 2, 3, 4],
      [4, 5, 6, 7, 1, 2, 3],
      [3, 4, 5, 6, 7, 1, 2],
      [2, 3, 4, 5, 6, 7, 1],
      [1, 2, 3, 4, 5, 6, 7]
    ],

    WEEKEND_TYPES : [
      [],
      [6, 0],
      [0, 1],
      [1, 2],
      [2, 3],
      [3, 4],
      [4, 5],
      [5, 6],
      undefined,
      undefined,
      undefined,
      [0],
      [1],
      [2],
      [3],
      [4],
      [5],
      [6]
    ],

    DAY_NAME : [
        'Sunday',
        'Monday',
        'Thuesday',
        'Wednesday',
        'Thursday',
        'Friday',
        'Saturday'
    ],

    ERROR : [
        '#DIV/0!',
        '#N/A',
        '#NAME?',
        '#NUM!',
        '#NULL!',
        '#REF!',
        '#VALUE!',
        '#ERROR!',
        '#ERROR_MOMENT_JS_REQUIRED!',
        '#ERROR_JSTAT_JS_REQUIRED!',
        '#ERROR_AJAX_URL_REQUIRED!',
        '#ERROR_SEND_REQUEST!',
        '#UNDEFINED_VARIABLE!'
    ],

    ERRKEY : {
        jStatRequired : '#ERROR_JSTAT_JS_REQUIRED!',
        momentRequired : '#ERROR_MOMENT_JS_REQUIRED!',
        ajaxUrlRequired : '#ERROR_AJAX_URL_REQUIRED!',
        sendRequestError : '#ERROR_SEND_REQUEST!'
    },

    VARIABLE : {},

    SELF_RENDER_FORMULA : [
        'GRAPH'
    ]
}/**
 * cell hold single element with formula and value information
 * @param  {sheet}      sheet       the sheet object where the cell is belong to
 * @param  {element}    element     dom element represent the cell (optional)
 * @return {void}
 */
function cell(sheet, element, address){
    this.sheet = sheet;

    this.value              = null;
    this.formattedValue     = null;
    this.computedValue      = null;
    this.floatValue         = null;
    this.affected           = false;
    this.processed          = false;
    this.dependencies       = {};
    this.dependant          = {};
    this.conditionalStyle   = false;
    this.address            = '';
    this.remoteDependency   = false;
    this.isCheckbox         = false;

    /** set cell element, is it in dom, or in memory */
    if(typeof(element) != 'undefined'){
        this.el = $(element);
    }else{
        this.el = false;
        this.address = typeof(address) != 'undefined' ? address : '';
    }

    this.init();
};

cell.fx = cell.prototype;/**
 * Initialize the cell object, preparing all necessary variables
 * @return {void}
 */
cell.fx.init = function(){
    var $address = (this.el) ? this.el.attr('data-cell') : this.address,
        $formula = (this.el) ? this.el.attr('data-formula') : '',
        $format  = (this.el) ? this.el.attr('data-format') : false,
        $value   = (this.el) ? this.el.val() : null,
        tagName  = (this.el) ? this.el.prop('tagName').toLowerCase() : '';

    /** assign address if data-cell is not present */
    if(!$address || $.trim($address) == ''){
        $address = 'CALX'+this.sheet.counter;
        if(this.el) {
            this.el.attr('data-cell', $address);
        }
        this.sheet.counter++;
    }else{
        $address = $address.toUpperCase()
    }

    /** set the formula as false if data-formula exists, but empty */
    if(!$formula || $.trim($formula) == ''){
        $formula = false;
    }else{
        $formula = $formula.replace('&quot;', '"')
                           .replace('&#39;', "'")
                           .replace('&#34;', '"')
    }

    if(tagName == 'input' && (this.el.attr('type') == 'checkbox' || this.el.attr('type') == 'radio')){
        var uncheckedVal = this.el.attr('data-unchecked');
            uncheckedVal = (typeof(uncheckedVal) == 'undefined') ? '' : uncheckedVal;

        $value = (this.el.prop('checked')) ? this.el.val() : uncheckedVal;
        this.isCheckbox = true;
    }

    if(this.el && this.formTags.indexOf(tagName) == -1){
        $value = this.el.text();
    }

    /** fallback to default format where data-format is not present or empty */
    if($format === false || typeof($format) === 'undefined'){
        $format = this.sheet.config.defaultFormat;
    }

    this.formula    = $formula;
    this.format     = $format;
    this.address    = $address;


    //console.log('cell[#'+this.sheet.elementId+'!'+$address+'] : Initializing the cell');
    if($format && typeof(numeral) != 'undefined' && $.trim($value) !== ''){
        var rawValue = numeral().unformat($value);

        if($format.indexOf('%') > -1 && ($value).indexOf('%') == -1){
            rawValue = rawValue/100;

        }
    }else{
        rawValue = ($.isNumeric($value)) ? parseFloat($value) : $value;
    }

    this.setValue(rawValue);

    if($.trim($value) != '' && $.isNumeric($value)){
        this.renderComputedValue();
    }
    //this.attachEvent();
};/**
 * calculate cells formula and process dependant
 */
cell.fx.calculate  = function(triggerEvent, renderComputedValue){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : calculating result of ['+this.formula+']');
    triggerEvent = (typeof triggerEvent == 'undefined') ? true : triggerEvent;
    renderComputedValue = (typeof renderComputedValue == 'undefined') ? true : renderComputedValue;

    /* clear list of affected cell */
    this.sheet.clearAffectedCell();

    if(this.sheet.config.autoCalculate && triggerEvent && typeof(this.sheet.config.onBeforeCalculate) == 'function'){
        this.sheet.config.onBeforeCalculate.call(this.sheet);
    }

    calx.isCalculating = true;
    this.evaluateFormula();

    for(var a in this.dependant){
        this.dependant[a].processDependant();
    }

    for(var a in this.sheet.dependant){
        this.sheet.dependant[a].calculate(false, false);
    }

    calx.isCalculating = false;


    if(this.sheet.hasRelatedSheet()){
        for(a in this.sheet.cells){
            //console.log('recalculating cell');
            if(this.sheet.cells[a].hasRemoteDependency()){
                this.sheet.cells[a].evaluateFormula();
                this.sheet.cells[a].processDependant();
                this.sheet.cells[a].renderComputedValue();

                //console.log('recalculating cell #'+this.sheet.el.attr('id')+'!'+a+'='+this.sheet.cells[a].getValue());
            }
        }
    }

    if(this.sheet.config.autoCalculate && triggerEvent && typeof(this.sheet.config.onAfterCalculate) == 'function'){
        this.sheet.config.onAfterCalculate.call(this.sheet);
    }

    if(this.sheet.config.autoCalculate && triggerEvent && typeof(this.sheet.config.onBeforeRender) == 'function'){
        this.sheet.config.onBeforeRender.call(this.sheet);
    }

    if(renderComputedValue){
        this.renderComputedValue();
    }

    if(this.sheet.config.autoCalculate && triggerEvent && typeof(this.sheet.config.onAfterRender) == 'function'){
        this.sheet.config.onAfterRender.call(this.sheet);
    }

    return this;
};/**
 * build inter-cell dependency and dependant list, used for triggerring calculation that related to other cell
 * @return {void}
 */
cell.fx.buildDependency = function(){
    var pattern = {
            remoteCellRange : /\#[A-Za-z0-9_]+\s*!\s*[A-Za-z]+[0-9]+\s*:\s*[A-Za-z]+[0-9]+/g,
            remoteCell      : /\#[A-Za-z0-9_]+\s*!\s*[A-Za-z]+[0-9]+/g,
            cellRange       : /[A-Za-z]+[0-9]+\s*:\s*[A-Za-z]+[0-9]+/g,
            cell            : /[A-Z]+[0-9]+/g
        },
        formula     = this.formula,
        sheetKey    = '#'+this.sheet.el.attr('id'),
        cellAddress = this.address,
        dependencies,
        a, i, j, key,
        formulaPart,
        cellStart,
        cellStop,
        cellPart,
        cellObject,
        cellMatch,
        sheetId,
        sheetIdentifier;

    /** clear up the dependant and dependency reference */
    for(a in this.dependencies){

        /** remove self from dependant registry in dependencies list before removing */
        if(a.indexOf('#') === -1){
            this.dependencies[a].removeDependant(cellAddress);
        }else{
            this.dependencies[a].removeDependant(sheetKey+'!'+cellAddress);
        }

        /** remove cell from dependencies list after removing itself from dependant registry */
        delete this.dependencies[a];
    }


    /** if formula exist, start scanning cell address inside the formula */
    if(formula){
        /** searching for cells in formula */
        for(a in pattern){
            cellMatch   = formula.match(pattern[a]);
            formula     = formula.replace(pattern[a], '');

            if(null !== cellMatch){
                switch(a){
                    /* First round, find the remote cell range and take it from formula */
                    case "remoteCellRange":
                        for(i = 0; i < cellMatch.length; i++){
                            formulaPart = cellMatch[i].split('!');
                            sheetId     = $.trim(formulaPart[0]);
                            cellPart    = formulaPart[1].split(':');
                            cellStart   = $.trim(cellPart[0]);
                            cellStop    = $.trim(cellPart[1]);

                            /** list all cells in range as dependencies */
                            dependencies = this.sheet.getRemoteCellRange(sheetId, cellStart, cellStop);

                            /** get the calx identifier of the remote sheet */
                            sheetIdentifier = $(sheetId).attr('data-calx-identifier');


                            /** if not identified yet, init calx on it and get the identifier */
                            if(typeof(sheetIdentifier) == 'undefined' || typeof(calx.sheetRegistry[sheetIdentifier]) == 'undefined'){
                                $(sheetId).calx();

                                sheetIdentifier = $(sheetId).attr('data-calx-identifier');
                            }

                            /** build dependency relationship to each sheet */
                            if(typeof(sheetIdentifier) !='undefined' && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
                                calx.sheetRegistry[sheetIdentifier].registerDependant(this.sheet);
                                this.sheet.registerDependency(calx.sheetRegistry[sheetIdentifier]);
                            }

                            /** build dependency relationship on current cell and it's dependencies */
                            for(j in dependencies){
                                key = sheetId+'!'+j;
                                if(typeof(this.dependencies[key]) == 'undefined' && false !== dependencies[j]){
                                    this.hasRemoteDependency(true);
                                    this.dependencies[key] = dependencies[j];
                                    dependencies[j].registerDependant(sheetKey+'!'+this.getAddress(), this);
                                }
                            }
                        }
                        break;

                    case "remoteCell":
                        for(i = 0; i < cellMatch.length; i++){
                            formulaPart = cellMatch[i].split('!');
                            sheetId     = $.trim(formulaPart[0]);
                            cellPart    = $.trim(formulaPart[1]);

                            dependencies = this.sheet.getRemoteCell(sheetId, cellPart);
                            sheetIdentifier = $(sheetId).attr('data-calx-identifier');

                            if(typeof(sheetIdentifier) == 'undefined' || typeof(calx.sheetRegistry[sheetIdentifier]) == 'undefined'){
                                $(sheetId).calx();
                            }

                            if(typeof(sheetIdentifier) !='undefined' && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
                                calx.sheetRegistry[sheetIdentifier].registerDependant(this.sheet);
                                this.sheet.registerDependency(calx.sheetRegistry[sheetIdentifier]);
                            }

                            key = sheetId+'!'+cellPart;
                            if(typeof(this.dependencies[key]) == 'undefined' && false !== dependencies){
                                this.hasRemoteDependency(true);
                                this.dependencies[key] = dependencies;
                                dependencies.registerDependant(sheetKey+'!'+this.getAddress(), this);

                            }
                        }
                        break;

                    case "cellRange":
                        for(i = 0; i < cellMatch.length; i++){
                            cellPart    = cellMatch[i].split(':');
                            cellStart   = $.trim(cellPart[0]);
                            cellStop    = $.trim(cellPart[1]);

                            dependencies = this.sheet.getCellRange(cellStart, cellStop);
                            for(j in dependencies){
                                if(typeof(this.dependencies[j]) == 'undefined' && false !== dependencies[j]){
                                    this.dependencies[j] = dependencies[j];
                                    dependencies[j].registerDependant(this.getAddress(), this);

                                }
                            }
                        }
                        break;

                    case "cell":
                        for(i = 0; i < cellMatch.length; i++){
                            cellPart    = cellMatch[i];

                            dependencies = this.sheet.getCell(cellPart);
                            if(typeof(this.dependencies[cellPart]) == 'undefined' && false !== dependencies){
                                this.dependencies[cellPart] = dependencies;
                                dependencies.registerDependant(this.getAddress(), this);

                            }
                        }
                        break;
                }
            }
        }
    }

    return this;

    //var dlist = [];
    //for(a in this.dependencies){
    //    dlist.push(a);
    //}
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] :  Building dependency list '+dlist);
};/**
 * remove key from the dependency list
 * @param  {string} key [the dependency key, can be cellAddress, or #sheet>cellAddress]
 * @return {void}
 */
cell.fx.removeDependency = function(key){
    if(typeof(this.dependencies[key]) != 'undefined'){
        delete this.dependencies[key];
    }
};/**
 * process cell's dependency list and mark it as processed
 * @param  {bool} selfRender  [set render itself or not]
 * @param  {bool} childRender [set render child as well or not]
 * @return {void}
 */
cell.fx.processDependency = function(){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing dependency');

    //selfRender  = (typeof(selfRender) == 'undefined') ? false : selfRender;
    //childRender = (typeof(childRender) == 'undefined') ? false : childRender;

    /**
     * process all affected dependencies first, then evaluate the formula
     * mark each cell as processed by setting the processed flag as true
     */
    if(false == this.isProcessed()){
        //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing flag is ['+this.processed+'], processing...')
        for (var a in this.dependencies){
            if(false == this.dependencies[a].isProcessed()){
                this.dependencies[a].processDependency();
            }
        }

        this.evaluateFormula();
        this.setProcessed(true);

        if(this.sheet.affectedCell.indexOf(this.address) == -1){
            this.sheet.affectedCell.push(this.address);
            //console.log(this.sheet.affectedCell);
        }
    }else{
        //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing flag is ['+this.processed+'], leaving...')
    }

    //if(selfRender){
    //    this.renderComputedValue();
    //}
};cell.fx.registerDependant = function(key, cell){
    if(typeof(this.dependant[key]) == 'undefined' && cell){
        this.dependant[key] = cell;
    }
};cell.fx.removeDependant = function(key){
    if(typeof(this.dependant[key]) != 'undefined'){
        delete this.dependant[key];
    }
};/**
 * Process all cell that depend on this cell once this cel value is updated
 *
 * @return {[type]} [description]
 */
cell.fx.processDependant = function(){
    var $continue;
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing dependants');


    //prefix       = (typeof(prefix) == 'undefined') ? '--' : prefix;
    //selfRender   = (typeof(selfRender) == 'undefined') ? false : selfRender;
    //parentRender = (typeof(parentRender) == 'undefined') ? false : parentRender;

    if(false === this.isProcessed() || true === calx.isCalculating){
        //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing flag is ['+this.processed+'], processing...')

        this.processDependency();
        //console.log((new Date()).valueOf());
        //this.evaluateFormula();

        for(var a in this.dependant){
            //prefix = prefix+'--';
            //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing dependant ['+a+']');
            if(!this.dependant[a].isProcessed()){
                $continue = this.dependant[a].processDependant();
                if(false === $continue){
                    return $continue;
                }
            }else{
                //console.log(a+' is already processed, leaving...');
            }
        }

        this.setAffected(false);
        this.setProcessed(true);

        if(this.sheet.affectedCell.indexOf(this.address) == -1){
            this.sheet.affectedCell.push(this.address);
            //console.log(this.sheet.affectedCell);
        }
    }else{
        //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : processing flag is ['+this.processed+'], leaving...')
        return false;
    }

};cell.fx.hasRemoteDependency = function(status){
    if(typeof(status) == 'undefined'){
        return this.remoteDependency
    }else{
        this.remoteDependency = status;
    }
};/**
 * render calculated value or final value to the element bound to this cell
 * @return {void}
 */
cell.fx.renderComputedValue = function(){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : rendering computed value');

    if(this.formula && this.formula.substring(0,5).toLowerCase() == 'graph'){
        return this;
    }else if(false !== this.el){
        var tagName     = this.el.prop('tagName').toLowerCase(),
            isFormTag   = this.formTags.indexOf(tagName) > -1,
            originalVal = (this.formula) ? this.computedValue : this.value,
            formattedVal= (
                            this.format != ''
                            && typeof(numeral) != 'undefined'
                            && originalVal !== ''
                            && originalVal !== false
                            && originalVal !== null
                            && data.ERROR.indexOf(originalVal) == -1
                            && $.isNumeric(originalVal)
                        )
                        ? numeral(originalVal).format(this.format)
                        : originalVal;

        //console.log('render computed value of '+this.address+ ' with formula '+this.formula);
        if(isFormTag){
            if(this.isCheckbox){
                this.el.prop('checked', (originalVal == this.el.val()));
            }else if(tagName == 'select'){
                this.el.val(originalVal);
            }else if(tagName == 'input' || tagName == 'textarea'){
                this.el.val(formattedVal);
            }
        }else{
            this.el.html(formattedVal);
        }
    }

    //console.log(typeof(this.conditionalStyle));

    if(typeof(this.conditionalStyle) == 'function'){
        var css = this.conditionalStyle.apply(null, [this.getValue(), this.el]);

        if(typeof(css) == 'object'){
            this.el.css(css);
        }
    }

    return this;
}/**
 * resync cell value with element value, in case the form is reseted
 * @return {[type]} [description]
 */
cell.fx.resyncValue = function(){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : resyncing value with element value');

    if(false !== this.el){
        var tagName     = this.el.prop('tagName').toLowerCase(),
            isFormTag   = this.formTags.indexOf(tagName) > -1,
            elValue     = (isFormTag) ? this.el.val() : this.el.text();

        if(this.isCheckbox && !this.el.prop('checked')){
            elValue = this.el.attr('data-unchecked-value') || '';
        }

        this.setValue(elValue);
    }
};/**
 * sync formula from the el to the cells object
 */
cell.fx.resyncFormula = function(){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : resyncing formula with the element formula');

    if(this.el && this.el.attr('data-formula') != this.formula){
        this.formula = this.el.attr('data-formula');
        this.buildDependency();
    }
}/**
 * find the circular reference in cell dependency tree
 * @param  {string} address     the cell address that need to be checked
 * @return {bool}               true if circular reference found, false if not found
 */
cell.fx.checkCircularReference = function(address){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : checking circular reference');
    var a, isCircular = false;

    if(typeof(address) == 'undefined'){
        address = this.getAddress();
    }

    if(false !== this.formula){
        /** first, check if the dependencies is redudant */
        for(a in this.dependencies){
            isCircular = isCircular || (a == address);

            //console.log(prefix+'cell: '+this.getAddress()+', dependencies: '+a+', is circular: '+isCircular);
            if(isCircular){
                return true;
            }
        }

        /** second, check if the dependencies of the dependency is redudant */
        for(a in this.dependencies){
            //console.log(prefix+'cell: '+this.getAddress()+', dependencies of dependency: '+a+', is circular: '+isCircular);

            isCircular = isCircular || this.dependencies[a].checkCircularReference(address);
            if(isCircular){
                return true;
            }
        }
    }

    return isCircular;
};/**
 * evaluate cell formula and put the result in computed value container
 * @return {mixed}
 */
cell.fx.evaluateFormula = function(){
    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : evaluating formula ['+this.formula+']');

    if(this.formula){
        try{
            this.sheet.setActiveCell(this);
            this.computedValue = this.sheet.evaluate(this.formula);
            //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : formula result: '+this.computedValue);
            return this.computedValue;
        }catch(e){
            //console.log(e);
            this.computedValue = '#ERROR!';
            return false;
            //console.error('formula error on '+this.address+' : '+this.formula);
        }
    }

    return false;
};/** form tag reference */
cell.fx.formTags = ['input', 'select', 'textarea', 'button'];/**
 * set conditional style callback
 * @param {Function} callback [description]
 */
cell.fx.setConditionalStyle = function(callback){
    if(typeof(callback) == 'function'){
        this.conditionalStyle = callback;
    }
}/**
 * set formatting rule to the cell
 * @param {string} format       format rule to define formatting on rendered value
 */
cell.fx.setFormat = function(format){
    this.format = format;
    if(false !== this.el){
        this.el.attr('data-format', format);
        this.renderComputedValue();
    }

    if(this.sheet.affectedCell.indexOf(this.address) == -1){
        this.sheet.affectedCell.push(this.address);
    }

    return this;
};/**
 * return format definition of the current cell object
 * @return {string}     format definition or false
 */
cell.fx.getFormat = function(){
    return this.format;
};/**
 * set formula definition to the cell
 * @param {string} formula       formula definition
 */
cell.fx.setFormula = function(formula){
    //console.log('set formula of #'+this.sheet.elementId+'!'+this.address+' to be '+formula);
    if(typeof(formula) !== 'string'){
        return false;
    }

    this.formula = formula;
    if(false !== this.el){
        this.el.attr('data-formula', formula);
    }

    //console.log('building dependency');
    this.buildDependency();

    //console.log('processing dependant');
    //this.processDependant(true, true);

    //this.evaluateFormula();
    //
    //
    if(this.sheet.affectedCell.indexOf(this.address) == -1){
        this.sheet.affectedCell.push(this.address);
    }
    return this;
};cell.fx.getFormula = function(){
    return this.formula;
};/**
 * get current cell address
 * @return {string}     cell address of the current cell object
 */
cell.fx.getAddress = function(){
    return this.address;
};/**
 * get formatted value of the cell based on the formula definition
 * @return {string}     the formatted value
 */
cell.fx.getFormattedValue = function(){
    var originalVal = (this.formula) ? this.computedValue : this.value,
        formattedVal= (
            this.format != ''
            && typeof(numeral) != 'undefined'
            && originalVal !== ''
            && originalVal !== false
            && originalVal !== null
            && data.ERROR.indexOf(originalVal) == -1
            && $.isNumeric(originalVal)
        )
        ? numeral(originalVal).format(this.format)
        : originalVal;

    return formattedVal;
};/**
 * set cell value and sync it with the bound element, and trigger recalculation on all cell depend to it
 * @param {mixed}   value       value to be inserted into the cell
 */
cell.fx.setValue = function(value){

    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : setting value to be : '+value);

    this.value = value;

    if(this.sheet.affectedCell.indexOf(this.address) == -1){
        this.sheet.affectedCell.push(this.address);
    }

    /* set value mean set value, no other thing should be done */
    return this;
};cell.fx.getValue = function(){
    var returnValue;

    if(this.formula){
        returnValue = this.computedValue;
    }else{
        returnValue = this.value;
    }

    return returnValue;
}/**
 * mark cell as affected by other cell, used to decide whether to
 * process the cell or not when processing dependency tree
 */
cell.fx.setAffected = function(affected){
    affected = typeof(affected) == 'undefined' ? true : affected;
    this.affected = affected;

    return this;
};cell.fx.isAffected = function(){
    return this.affected;
};/**
 * [setProcessed description]
 * @param {[type]} processed [description]
 */
cell.fx.setProcessed = function(processed){
    this.processed = (typeof(processed) == 'undefined') ? true : processed;

    //console.log('cell[#'+this.sheet.elementId+'!'+this.address+'] : mark as processed ['+processed+']');
    return this;
}/**
 * [isProcessed description]
 * @return {Boolean} [description]
 */
cell.fx.isProcessed = function(){
    return this.processed;
};cell.fx.highlightDependant = function(){
    for(var a in this.dependant){
        this.dependant[a].el.css('border', 'solid 1px blue');
    }
};

cell.fx.highlightDependency = function(){
    for(var a in this.dependencies){
        this.dependencies[a].el.css('border', 'solid 1px red');
    }
};

/**
 * Sheet object, represent each element as single sheet
 * @param  {string}     identifier :unique key for accessing sheet object internally
 * @param  {domElement} element    :dom element as scope for sheet to work with
 * @param  {object}     config     : configuration object
 * @return {void}
 */
function sheet(identifier, element, config){
    /** @type {string} The sheet unique identifier */
    this.identifier   = identifier;

    /** @type {object} jQuery dom element */
    this.el           = $(element);

    /** @type {string} Default language setting */
    this.lang         = 'en';

    /** @type {object} Cells registry containing all available cell */
    this.cells        = {};

    /** @type {object} Variable registry, containing all defined variable */
    this.variables    = {};

    /** @type {object} Sheet configuration object */
    this.config       = $.extend({}, defaultConfig, config);

    /** @type {number} Cell counter, count total cell in the sheet */
    this.counter      = 1;

    /** @type {boolean} Indicate if the sheet has relation with other sheet */
    this.relatedSheet = false;

    /** @type {string} The id of the element where the sheet is initialized and bound */
    this.elementId    = this.el.attr('id');

    /** @type {object} Registry containing sheets that depend on this sheet */
    this.dependant    = {};

    /** @type {object} Registry containing sheets that this sheet depend on*/
    this.dependencies = {};

    /** @type {boolean} Indicate the current sheet calculation is done */
    this.calculated   = false;

    /** @type {boolean} Indicate the current sheet calculation is in progress */
    this.calculating  = false;

    /** @type {object} Current cell object being calculated */
    this.activeCell   = null;
    this.totalCell    = 0;
    this.affectedCell = [];

    this.init();
};

sheet.fx = sheet.prototype;sheet.fx.init = function(){
    //console.log('sheet[#'+this.elementId+'] : Initializing the sheet');
    var cells = this.el.find('[data-cell],[data-formula],[data-format]'),
        sheet = this,
        $cell;

    this.totalCell = cells.length;
    this.parser = parserFactory(this);
    this.el.attr('data-calx-identifier', this.identifier);

    cells.each(function(){
        $cell = new cell(sheet, this);
        sheet.registerCell($cell);
    });


    for(var cellAddr in this.config.data){
        if(typeof(this.cells[cellAddr]) == 'undefined'){
            $cell = new cell(sheet, undefined, cellAddr);
            sheet.registerCell($cell);
        }
    }

    //sheet.buildCellDependency();
    sheet.attachEvent();
};/**
 * check circular reference on each cell registered to this sheet
 * @return {bool} true if exist, false if clear
 */
sheet.fx.checkCircularReference = function(){
    //console.log('sheet[#'+this.elementId+'] : checking circular reference');
    var a, response = {
            isCircular : false,
            cell : null
        };

    for(a in this.cells){
        response.isCircular = this.cells[a].checkCircularReference();
        if(true === response.isCircular){
            response.cell = this.cells[a];
            return response;
        }
    }

    return response;
}/**
 * mark all cell as not processed
 */
sheet.fx.clearProcessedFlag = function(){
    //console.log('sheet[#'+this.elementId+'] : clearing the processed flag');
    for(var a in this.cells){
        if(false !== this.cells[a].formula){
            this.cells[a].setProcessed(false);
            this.cells[a].setAffected(true);
        }else{
            this.cells[a].setProcessed(true);
            this.cells[a].setAffected(false);
        }
    }
};/**
 * building inter-cell dependency
 * once the formula is evaluated,
 * make sure all cell involved is evaluated first
 * @return {[type]} [description]
 */
sheet.fx.buildCellDependency = function(){
    //console.log('sheet[#'+this.elementId+'] : building cells dependency');
    var cell;

    for(cell in this.cells){
        this.cells[cell].buildDependency();
    }
};sheet.fx.renderComputedValue = function(){
    //console.log('sheet[#'+this.elementId+'] : rendering all computed value to the element');

    //console.log(this.el.attr('id'));
    //console.log(this.affectedCell);
    for(var a = 0; a < this.affectedCell.length; a++){
        this.cells[this.affectedCell[a]].renderComputedValue();
    }
    this.clearAffectedCell();
};sheet.fx.clearAffectedCell = function(){
    this.affectedCell = [];
};sheet.fx.hasRelatedSheet = function(){
    return this.relatedSheet;
};sheet.fx.clearCalculatedFlag = function(){
    var a;

    for(a in this.dependant){
        this.dependant[a].setCalculated(false);
    }


    for(a in this.dependencies){
        this.dependencies[a].setCalculated(false);
    }
};sheet.fx.isCalculated = function(){
    return this.calculated;
};sheet.fx.setCalculated = function(calculated){
    calculated = (typeof(calculated) == 'undefined') ? true : calculated;
    this.calculated  = calculated;
};sheet.fx.clearDependencies = function(){

};sheet.fx.registerDependant = function(dep){
    this.relatedSheet = true;
    if(typeof(this.dependant[dep.identifier]) == 'undefined'){
        this.dependant[dep.identifier] = dep;
    }
};sheet.fx.registerDependency = function(dep){
    this.relatedSheet = true;
    if(typeof(this.dependencies[dep.identifier]) == 'undefined'){
        this.dependencies[dep.identifier] = dep;
    }
};sheet.fx.obj = {
    type : 'cell'
};sheet.fx.comparator = {
    greater: function(a, b){
        return a > b;
    },

    greaterEqual: function(a, b){
        return a >= b;
    },

    less: function(a, b){
        return a < b;
    },

    lessEqual : function(a, b){
        return a <= b;
    },

    equal: function(a,b){
        return a == b;
    },

    notEqual: function(a,b){
        return a != b;
    }
};sheet.fx.getVariable = function(varName){
    var varIndex = varName[0],
        varUpperCase = varIndex.toUpperCase();

    if(varUpperCase == 'TRUE'){
        return true;
    }

    if(varUpperCase == 'FALSE'){
        return false;
    }

    if(varUpperCase == 'NULL'){
        return null;
    }

    if(typeof(this.variables[varIndex]) == 'undefined'){
        if(typeof(data.VARIABLE[varIndex]) == 'undefined'){
            return '#UNDEFINED_VARIABLE!';
        }else if(typeof(data.VARIABLE[varIndex]) == 'function'){
            return data.VARIABLE[varIndex].call(this);
        }else{
            return data.VARIABLE[varIndex];
        }
    }else if(typeof(this.variables[varIndex]) == 'function'){
        return this.variables[varIndex].call(this);
    }else{
        return this.variables[varIndex];
    }
};sheet.fx.time = function(time){
    var $time   = time.split(':'),
        $today  = new Date(),
        $hour   = typeof($time[0]) == 'undefined' ? 0 : $time[0],
        $minute = typeof($time[1]) == 'undefined' ? 0 : $time[1],
        $second = typeof($time[2]) == 'undefined' ? 0 : $time[2],
        $result = new Date($today.getFullYear(), $today.getMonth(), $today.getDate(), $hour, $minute, $second);

    return $result;
};sheet.fx.callFunction = function(functionName, params){
    var category, func;

    func = functionName.toUpperCase();
    if(typeof(formula[func]) == 'function'){
        return formula[func].apply(this, params);
    }

    for(category in formula){
        if(typeof(formula[category][func]) == 'function' ){
            return formula[category][func].apply(this, params);
        }
    }

    return '#NAME?'
};sheet.fx.getRemoteCell = function(sheet, address){
    var identifier = $(sheet).attr('data-calx-identifier');

    if(!identifier || typeof(calx.sheetRegistry[identifier]) == 'undefined'){
        return false;
    }

    return calx.sheetRegistry[identifier].getCell(address);
};sheet.fx.getRemoteCellRange = function(sheet, addressStart, addressStop){

    var identifier = $(sheet).attr('data-calx-identifier');

    if(!identifier || typeof(calx.sheetRegistry[identifier]) == 'undefined'){
        return false;
    }

    return calx.sheetRegistry[identifier].getCellRange(addressStart, addressStop);
};sheet.fx.getRemoteCellValue = function(sheet, address){
    var identifier = $(sheet).attr('data-calx-identifier');

    if(!identifier || typeof(calx.sheetRegistry[identifier]) == 'undefined'){
        return false;
    }

    return calx.sheetRegistry[identifier].getCellValue(address);
};sheet.fx.getRemoteCellRangeValue = function(sheet, addressStart, addressStop){

    var identifier = $(sheet).attr('data-calx-identifier');

    if(!identifier || typeof(calx.sheetRegistry[identifier]) == 'undefined'){
        return false;
    }

    return calx.sheetRegistry[identifier].getCellRangeValue(addressStart, addressStop);
};sheet.fx.getCellRangeValue = function(addressStart, addressStop){
    addressStart = addressStart.toUpperCase();
    addressStop = addressStop.toUpperCase();

    var cellRangeAddress= utility.cellRange(addressStart, addressStop),
        cellRangeLength = cellRangeAddress.length,
        cellRangeValue  = {},
        i;

    for (i = 0; i < cellRangeLength; i++) {
        cellRangeValue[cellRangeAddress[i]] = this.getCellValue(cellRangeAddress[i]);
    }

    return cellRangeValue;
};sheet.fx.getCellValue = function(address){
    var cell = address.toUpperCase();
    if(typeof(this.cells[cell]) == 'undefined'){
        return false;
    }
    return this.cells[cell].getValue();
};/**
 * evaluate given formula
 * @param  {string} formula     the formula need to be evaluated
 * @return {mixed}              result returned by the formula
 */
sheet.fx.evaluate = function(formula){
    //console.log('sheet[#'+this.elementId+'] : evaluating formula => '+formula);

    return this.parser.parse(formula);
};/**
 * update cell reference inside the sheet, detect removed and added cells
 */
sheet.fx.update = function(){
    //console.log('sheet[#'+this.elementId+'] : updating cells registry with current state of the element');

    var cells = this.el.find('[data-cell],[data-formula],[data-format]'),
        sheet = this,
        $cell;

    this.totalCell = cells.length;

    /** detect and remove detached cells and its reference */
    for(var a in this.cells){
        if(this.cells[a].el && !$.contains(document, this.cells[a].el[0])){
            delete(this.cells[a]);
        }
    }

    /** add new cell reference */
    cells.each(function(){
        var cellAddr = $(this).attr('data-cell');

        if(cellAddr && typeof(sheet.cells[cellAddr]) == 'undefined'){
            //console.log('new cell found '+cellAddr);
            $cell = new cell(sheet, this);
            sheet.registerCell($cell);
        }else{
            //console.log('resync cell '+cellAddr);
            sheet.cells[cellAddr].resyncValue();
            sheet.cells[cellAddr].resyncFormula();
        }
    });

    /** rebuild the dependency tree */
    this.buildCellDependency();
};/**
 * calculate all the sheet!
 */
sheet.fx.calculate = function(){
    //console.log('sheet[#'+this.elementId+'] : calculating the sheet');

    this.clearAffectedCell();

    if(typeof(this.config.onBeforeCalculate) == 'function'){
        this.config.onBeforeCalculate.call(this);
    }

    var a;

    this.calculateDependency(this.identifier);
    /** set all cell with formula as affected */
    this.clearProcessedFlag();

    for(a in this.cells){
        this.cells[a].processDependency();
    }

    this.setCalculated();
    //console.log(this.isCalculated());

    /*
    for(a in this.dependant){
        if(!this.dependant[a].isCalculated()){
            this.dependant[a].calculate();
        }
    }
    */

    for(a in this.cells){
        //console.log('recalculating cell');
        if(this.cells[a].hasRemoteDependency()){
            this.cells[a].evaluateFormula();
            //console.log('recalculating cell #'+this.el.attr('id')+'!'+a+'='+this.cells[a].getValue());
        }
    }

    this.calculateDependant(this.identifier);


    if(typeof(this.config.onAfterCalculate) == 'function'){
        this.config.onAfterCalculate.call(this);
    }

    if(typeof(this.config.onBeforeRender) == 'function'){
        this.config.onBeforeRender.call(this);
    }

    this.renderComputedValue();

    if(typeof(this.config.onAfterRender) == 'function'){
        this.config.onAfterRender.call(this);
    }

    return this;
};sheet.fx.calculateDependant = function(skip){

};sheet.fx.calculateDependency = function(skip){

};/**
 * register singgle cell to sheet's cell registry
 * @param  {object} cell    cell object
 * @return {void}
 */
sheet.fx.registerCell = function(cell){
    var address = cell.getAddress()
    this.cells[address] = cell;

    if(typeof this.config.data[address] != 'undefined'){
        var cellConfig = this.config.data[address];

        if(typeof cellConfig.value != 'undefined'){
            cell.setValue(cellConfig.value);
            cell.renderComputedValue();
        }

        if(typeof cellConfig.format != 'undefined'){
            cell.setFormat(cellConfig.format);
        }

        if(typeof cellConfig.formula != 'undefined'){
            cell.setFormula(cellConfig.formula);
        }

        if(typeof cellConfig.conditional_style != 'undefined'){
            cell.setConditionalStyle(cellConfig.conditional_style);
        }
    }

    if(this.affectedCell.indexOf(cell.getAddress()) == -1){
        this.affectedCell.push(cell.getAddress());
    }
};/**
 * register custom variable to the calx object
 * @param  {string} varName     variable name
 * @return {mixed}  varValue    variable value
 */
sheet.fx.registerVariable = function (varName, varValue) {
    if(typeof(varName) == 'object'){
        for(var a in varName){
            this.variables[a] = varName[a];
        }
    }else{
        this.variables[varName] = varValue;
    }
};/**
 * get cell object based on given address
 * @param  {string} address     cell address (A1, B1 etc)
 * @return {cell|false}         cell object represented by the address or false if not found
 */
sheet.fx.getCell = function(address){

    address = address.toUpperCase();
    if(typeof(this.cells[address]) != 'undefined'){
        return this.cells[address];
    }else{
        return false;
    }
};/**
 * get list of cell object based on given range
 * @param  {string} addressStart range start
 * @param  {string} addressStop  range stop
 * @return {object}              object containing all cell object in given range
 */
sheet.fx.getCellRange = function(addressStart, addressStop){

    addressStart = addressStart.toUpperCase();
    addressStop = addressStop.toUpperCase();

    var cellList        = utility.cellRange(addressStart, addressStop),
        cellListLength  = cellList.length,
        cellRange       = {},
        a;

    for(a = 0; a < cellListLength; a++){
        cellRange[cellList[a]] = this.getCell(cellList[a]);
    }

    return cellRange;
};/**
 * Apply calculated and formatted value to elements that represent the cell
 * @return sheet object
 */
sheet.fx.applyChange = function(){
    //console.log('sheet[#'+this.elementId+'] : applying all computed value to the element');
    var a;
    for(a in this.cells){
        this.cells[a].processDependency(false, false);
    }

    for(a in this.cells){
        this.cells[a].renderComputedValue();
    }

    return this;
};sheet.fx.scan = function(){

};/**
 * refresh is similar to update, but instead of scanning for added/removed cells,
 * it's remove whole cell registry and rebuild it
 */
sheet.fx.refresh = function(){
    //console.log('sheet[#'+this.elementId+'] : refreshing the sheet cells registry');
    var cells = this.el.find('[data-cell],[data-formula],[data-format]'),
        sheet = this,
        $cell;

    this.totalCell = cells.length;
    this.cells = {};

    cells.each(function(){
        $cell = new cell(sheet, this);
        sheet.registerCell($cell);
    });

    /** rebuild the dependency tree */
    this.buildCellDependency();
};/**
 * reset the form to  it's original value, and resync the value with the cell registry
 */
sheet.fx.reset = function(){
    //console.log('sheet[#'+this.elementId+'] : resetting form elements');

    var forms;

    if(this.el.prop('tagName').toLowerCase() == 'form'){
        forms = this.el;
    }else{
        forms = this.el.find('form');
    }

    forms.each(function(){
        this.reset();
    });

    for(var a in this.cells){
        this.cells[a].resyncValue();
    }

    this.calculate();
};/**
 * tell the sheet which cell is currently evaluating formula
 * @param {object} cell cell object
 */
sheet.fx.setActiveCell = function(cell){
    this.activeCell = cell;
};/**
 * get the current active cell
 * @return {object} currently active cell object
 */
sheet.fx.getActiveCell = function(){
    return this.activeCell;
};sheet.fx.attachEvent = function(){
    //console.log('sheet[#'+this.elementId+'] : attaching events to the element');

    var currentSheet = this;

    /**
     * get the unformatted value of the cell, and display it to the element
     */
    this.el.on('calx.getValue', 'input[data-cell]', function(){
        var cellAddr    = $(this).attr('data-cell'),
            currentCell = currentSheet.cells[cellAddr],
            cellValue   = currentCell.getValue(),
            cellFormat  = currentCell.getFormat();

        if(cellFormat && cellFormat.indexOf('%') >= 0){
            cellValue = cellValue*100+' %';
        }

        if(!currentCell.isCheckbox){
            currentCell.el.val(cellValue);
        }
        //console.log(currentCell.getValue());
    });

    /**
     * get the formatted value of the cell, and display it to the element
     */
    this.el.on('calx.renderComputedValue', 'input[data-cell]', function(){
        var cellAddr    = $(this).attr('data-cell'),
            currentCell = currentSheet.cells[cellAddr];

        currentCell.renderComputedValue();
    });

    /**
     * update value of the current cell internally
     */
    this.el.on('calx.setValue', 'input[data-cell], select[data-cell]', function(){
        var element     = $(this),
            cellAddr    = element.attr('data-cell'),
            currentCell = currentSheet.cells[cellAddr],
            oldVal      = currentCell.getValue(),
            newVal      = currentCell.el.val(),
            cellFormat  = currentCell.getFormat();

        if(currentCell.isCheckbox && currentCell.el.attr('type') == 'checkbox'){
            if(currentCell.el.prop('checked')){
                currentCell.setValue(newVal);
            }else{
                var uncheckedVal = currentCell.el.attr('data-unchecked');
                    uncheckedVal = (typeof(uncheckedVal) == 'undefined') ? '' : uncheckedVal,
                    newVal       = uncheckedVal;

                currentCell.setValue(uncheckedVal);
            }
        }else if(currentCell.isCheckbox && currentCell.el.attr('type') == 'radio'){
            currentCell.setValue(newVal);

            currentSheet.el
                        .find('[name='+currentCell.el.attr('name')+']')
                        .not(currentCell.el)
                        .each(function(){
                            var radioBox     = $(this),
                                uncheckedVal = radioBox.attr('data-unchecked'),
                                cellAddr     = radioBox.attr('data-cell');

                            uncheckedVal = (typeof(uncheckedVal) == 'undefined') ? '' : uncheckedVal;

                            currentSheet.cells[cellAddr].setValue(uncheckedVal);
                        });
        }else{
            if(cellFormat && typeof(numeral) != 'undefined' && $.trim(newVal) !== ''){
                rawValue = numeral().unformat(newVal);

                if(cellFormat.indexOf('%') > -1 && (newVal).indexOf('%') == -1){
                    rawValue = rawValue/100;

                }
            }else{
                rawValue = ($.isNumeric(newVal)) ? parseFloat(newVal) : newVal;
            }

            currentCell.setValue(rawValue);
        }

        if(oldVal != newVal){
            currentCell.setAffected(true);
        }

    });

    /**
     * calculate the whole sheet
     */
    this.el.on('calx.calculateSheet', 'input[data-cell]', function(){
        currentSheet.calculate();
    });

    /**
     * update current cell value, and recalculate it's dependant
     */
    this.el.on('calx.calculateCellDependant', 'input[data-cell], select[data-cell]', function(){
        var cellAddr    = $(this).attr('data-cell'),
            currentCell = currentSheet.cells[cellAddr];

        if(!currentCell.isAffected()){
            return;
        }

        if(true === calx.isCalculating){
            calx.isCalculating = false;
        }
        currentSheet.clearProcessedFlag();
        currentCell.calculate(true, false);

        if(currentSheet.hasRelatedSheet()){
            currentSheet.calculate();
        }else{
            currentSheet.renderComputedValue();
        }

    });

    /**
     * bind to internal event, so no need to unbind the real event on destroy
     */
    this.el.on(currentSheet.config.autoCalculateTrigger, 'input[data-cell]',function(){
        //console.log('blurred');
        var $this = $(this);
        if(!$this.attr('data-formula')){
            if(currentSheet.config.autoCalculate){
                //console.log('calculating dependant');
                setTimeout(function(){
                    $this.trigger('calx.calculateCellDependant');
                }, 50);
            }
        }
    });

    this.el.on('blur', 'input[data-cell]', function(){
        //console.log($(this).attr('data-cell')+'blur');
        $(this).trigger('calx.renderComputedValue');
    });

    /**
     * change behaviour, based on configuration
     * autoCalculate : on   => calx.calculateCellDependant
     * autoCalculate : off  => calx.setValue
     */
    this.el.on('change', 'select[data-cell]', function(){
        $(this).trigger('calx.setValue');

        if(currentSheet.config.autoCalculate){
            $(this).trigger('calx.calculateCellDependant');
        }
    });

    this.el.on('click', 'input[data-cell][type=checkbox], input[data-cell][type=radio]', function(){

        $(this).trigger('calx.setValue');

        if(currentSheet.config.autoCalculate){
            $(this).trigger('calx.calculateCellDependant');
        }
    });

    /** focus does not depend on configuration, always get the value on focus */
    this.el.on('focus', 'input[data-cell]',function(){
        //console.log($(this).attr('data-cell')+'focus');
        $(this).trigger('calx.getValue');
    });

    /** keyup does not depend on configuration, always set value on keyup */
    this.el.on('keyup', 'input[data-cell]',function(e){
        //console.log($(this).attr('data-cell')+'key up');
        if($(this).attr('data-formula')){
            e.preventDefault();
            return false;
        }else{
            $(this).trigger('calx.setValue');
        }
    });
};

sheet.fx.detachEvent = function(){
    //console.log('sheet[#'+this.elementId+'] : detaching events from the element');

    this.el.off('calx.getValue');
    this.el.off('calx.setValue');
    this.el.off('calx.renderComputedValue');
    this.el.off('calx.calculateSheet');
    this.el.off('calx.calculateCellDependant');
}    /**
     * [calx : the calx core object to work with jquery as plugin]
     * @type {Object}
     */
    var calx = {
        /** flag to indicate that calx is calculating */
        isCalculating : false,

        /** Calx version */
        version : '2.2.7',

        /** sheets collection */
        sheetRegistry : {},

        /**
 * initialize sheet object and register to internal calx.sheetRegistry
 *
 * @param  {object} option      option to override the default option
 * @return {object}             jQuery object
 */
init : function (option) {
    var a, sheetIdentifier;

    /** initializing sheet object on each elements */
    this.each(function(){
        //console.log('initialize sheet');
        sheetIdentifier = $(this).attr('data-calx-identifier');

        if(!sheetIdentifier || typeof(calx.sheetRegistry[sheetIdentifier]) == 'undefined'){
            sheetIdentifier = 'CALX'+Object.keys(calx.sheetRegistry).length;

            calx.sheetRegistry[sheetIdentifier] = new sheet(sheetIdentifier, this, option);

        }else{
            //console.log('second call should be refresh');
            calx.sheetRegistry[sheetIdentifier].refresh();
        }
    });

    /** building dependency tree between cell and sheet */
    for(sheetIdentifier in calx.sheetRegistry){
        //console.log('build cell dependency');
        calx.sheetRegistry[sheetIdentifier].buildCellDependency();
    }

    /** apply additional action based on configuration */
    for(sheetIdentifier in calx.sheetRegistry){

        /** check circular reference after tree has been built */
        if(calx.sheetRegistry[sheetIdentifier].config.checkCircularReference){
            var reference = calx.sheetRegistry[sheetIdentifier].checkCircularReference();

            if(reference.isCircular){
                var errorMessage = 'Circular reference detected, this may cause calx to stop working.\ncell : '
                                    +reference.cell.getAddress()
                                    +'\nformula : '
                                    +reference.cell.getFormula()
                                    +'\n\nPlease check each cells involved in the formula that has direct or indirect reference to '
                                    +reference.cell.getAddress();

                alert(errorMessage);
                $.error(errorMessage);
            }
        }

        /** calculate and render the result */
        if(calx.sheetRegistry[sheetIdentifier].config.autoCalculate){
            calx.sheetRegistry[sheetIdentifier].calculate();
        }

        calx.sheetRegistry[sheetIdentifier].renderComputedValue();
    }

    return this;
},
        /**
 * register custom function to the calx formula sets
 * @param  {string}     funcName        the function name, must be all uppercase
 * @param  {function}   funcDefinition  the function definition to describe how the function should behave
 * @param  {bool}       override        override flag, should it override built in function if the same name exists
 * @return {void}
 */
registerFunction : function (funcName, funcDefinition, override) {
    override = (typeof(override) == 'undefined') ? false : override;

    if(override){
        for(var a in formula){
            if(typeof(formula[a][funcName]) != 'undefined'){
                delete(formula[a][funcName]);
            }
        }
    }
    formula.user_defined[funcName] = funcDefinition;
},
        /**
 * register custom variable to the calx object / sheet object
 * @param  {string} varName     variable name
 * @param  {mixed}  varValue    variable value
 * @param  {bool}   global      register variable as global or only in current sheet
 */
registerVariable : function (varName, varValue, global) {
    global = typeof(global) == 'undefined' ? false : global;

    if(this.length === 0){
        global = true;
    }

    if(global){
        if(typeof(varName) == 'object'){
            for(var a in varName){
                data.VARIABLE[a] = varName[a];
            }
        }else{
            data.VARIABLE[varName] = varValue;
        }
    }else{
        this.each(function(){
            var sheetIdentifier = $(this).attr('data-calx-identifier');

            if(sheetIdentifier && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
                calx.sheetRegistry[sheetIdentifier].registerVariable(varName, varValue);
                calx.sheetRegistry[sheetIdentifier].calculate();
            }
        });
    }

    return this;
},
        /**
 * refresh sheet reference to the current dom state and rebuild
 * the cell registry and dependency tree from the scratch
 *
 * @return {object}             jQuery object
 */
refresh : function () {
    return this.each(function(){
        var sheetIdentifier = $(this).attr('data-calx-identifier');
        //console.log(sheetIdentifier);

        if(sheetIdentifier && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
            calx.sheetRegistry[sheetIdentifier].refresh();
        }
    });
},
        /**
 * update sheet reference to the current dom state
 */
update : function () {
    return this.each(function(){
        var sheetIdentifier = $(this).attr('data-calx-identifier');
        //console.log(sheetIdentifier);

        if(sheetIdentifier && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
            calx.sheetRegistry[sheetIdentifier].update();
        }
    });
},
        /**
 * get sheet object bound to the element
 * @return {object}             the sheet object
 */
getSheet : function(){
    var $this       = $(this),
        $identifier = $this.attr('data-calx-identifier');

    return typeof(calx.sheetRegistry[$identifier]) == 'undefined' ? false : calx.sheetRegistry[$identifier];
},
        /**
 * get cell object of current sheet related to the selected element,
 * the selector should only select single object, e.g. $('#id')
 *
 * @param  {string} address     the cell's address
 * @return {object}             the cell's object
 */
getCell : function(address){
    var $this       = $(this),
        $identifier = $this.attr('data-calx-identifier'),
        $sheet      = calx.sheetRegistry[$identifier];

    return $sheet.getCell(address);
},
        /**
 * Get the utility object in case its needed
 * @return {object}     utility object
 */
getUtility : function(){
    return utility;
},
        /**
 * Get the full forula set object in case its needed
 * @return {object}     formula object
 */
getFormula : function(){
    return formula;
},
        /**
 * Evaluate formula specific to the selected sheet,
 * the selector should only select single object, e.g. $('#id')
 *
 * @param  {string} formula     the formula to be evaluated
 * @return {mixed}              result of the formula evaluation
 */
evaluate : function(formula){
    var $this       = $(this),
        $identifier = $this.attr('data-calx-identifier'),
        $sheet      = calx.sheetRegistry[$identifier];

    return $sheet.evaluate(formula);
},
        /**
 * Destroy calx instance and remove reference from the element
 *
 * @return {object}     jQuery Object
 */
destroy : function(){
    this.each(function(){
        var $sheet          = $(this),
            a,
            sheetIdentifier = $sheet.attr('data-calx-identifier');

        $sheet.removeAttr('data-calx-identifier');

        if(typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
            calx.sheetRegistry[sheetIdentifier].detachEvent();
            calx.sheetRegistry[sheetIdentifier].clearDependencies();
            delete calx.sheetRegistry[sheetIdentifier];
        }
    });

    return this;
},
        /**
 * Reset the form to the initial value and re-sync the value with the sheet object
 */

reset: function(){
    return this.each(function(){
        var sheetIdentifier = $(this).attr('data-calx-identifier');
        //console.log(sheetIdentifier);

        if(sheetIdentifier && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
            calx.sheetRegistry[sheetIdentifier].reset();
        }
    });
},
        /**
 * calculate sheet object related to the selected element
 *
 * @return {object} jQuery Object
 */
calculate : function(){

    return this.each(function(){
        /** get the sheet identifier attached to the element */
        var sheetIdentifier = $(this).attr('data-calx-identifier');
        //console.log(sheetIdentifier);

        /** retrieve te sheet objectfrom registry, and calculate */
        if(sheetIdentifier && typeof(calx.sheetRegistry[sheetIdentifier]) != 'undefined'){
            calx.sheetRegistry[sheetIdentifier].calculate();
        }
    });
},
        /**
 * set value of specific cell on the sheet related to the selected element,
 * the selector should only select single object, e.g. $('#id')
 *
 * @param  {string} address     the cell's address
 * @param  {string} value       the cell's value
 * @return {void}
 */
setValue : function(address, value){
    var $this       = $(this),
        $identifier = $this.attr('data-calx-identifier'),
        $sheet      = calx.sheetRegistry[$identifier],
        $cell       = $sheet.getCell(address);

    $cell.setValue(value).renderComputedValue();

    if($sheet.config.autoCalculate){
        $sheet.calculate();
    }
}
    };    /**
     * the surrogate of the calx world to the jQuery world
     * @param  string $action  [calx method]
     * @param  object $options [option object]
     * @return jQuery
     */
    $.fn.calx = function($action, $options) {
        if (calx[$action]) {
            return calx[$action].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof($action) == 'object' || typeof($action) == 'undefined') {
            var $calx = calx.init.apply(this, arguments);
            return $calx;
        } else {
            $.error('Method ' + $action + ' does not exist on jQuery.calx');
        }
    };
})(jQuery, numeral, moment, jStat);