openeo-processes/mean.json at master · Open-EO/openeo-processes · GitHub

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{
    "id": "mean",
    "summary": "Arithmetic mean (average)",
    "description": "The arithmetic mean of an array of numbers is the quantity commonly called the average. It is defined as the sum of all elements divided by the number of elements.\n\nAn array with solely no-data values returns the no-data value (or `null`).",
    "categories": [
        "math > statistics",
        "reducer"
    ],
    "parameters": [
        {
            "name": "data",
            "description": "An array of numbers.",
            "schema": {
                "type": "array",
                "items": {
                    "type": [
                        "number",
                        "null"
                    ]
                }
            }
        },
        {
            "name": "ignore_nodata",
            "description": "Indicates whether no-data values are ignored or not. Ignores them by default. If set to `false`, any no-data value in the array results in a no-data value (or `null`).",
            "schema": {
                "type": "boolean"
            },
            "default": true,
            "optional": true
        }
    ],
    "returns": {
        "description": "The computed arithmetic mean.",
        "schema": {
            "type": [
                "number",
                "null"
            ]
        }
    },
    "examples": [
        {
            "arguments": {
                "data": [
                    1,
                    0,
                    3,
                    2
                ]
            },
            "returns": 1.5
        },
        {
            "arguments": {
                "data": [
                    9,
                    2.5,
                    null,
                    -2.5
                ]
            },
            "returns": 3
        },
        {
            "arguments": {
                "data": [
                    1,
                    null
                ],
                "ignore_nodata": false
            },
            "returns": null
        }
    ],
    "links": [
        {
            "rel": "about",
            "href": "http://mathworld.wolfram.com/ArithmeticMean.html",
            "title": "Arithmetic mean explained by Wolfram MathWorld"
        }
    ],
    "process_graph": {
        "count_condition": {
            "process_id": "if",
            "arguments": {
                "value": {
                    "from_parameter": "ignore_nodata"
                },
                "accept": null,
                "reject": true
            }
        },
        "count": {
            "process_id": "count",
            "arguments": {
                "data": {
                    "from_parameter": "data"
                },
                "condition": {
                    "from_node": "count_condition"
                }
            }
        },
        "sum": {
            "process_id": "sum",
            "arguments": {
                "data": {
                    "from_parameter": "data"
                },
                "ignore_nodata": {
                    "from_parameter": "ignore_nodata"
                }
            }
        },
        "divide": {
            "process_id": "divide",
            "arguments": {
                "x": {
                    "from_node": "sum"
                },
                "y": {
                    "from_node": "count"
                }
            }
        },
        "neq": {
            "process_id": "neq",
            "arguments": {
                "x": {
                    "from_node": "count"
                },
                "y": 0
            }
        },
        "if": {
            "process_id": "if",
            "arguments": {
                "value": {
                    "from_node": "neq"
                },
                "accept": {
                    "from_node": "divide"
                }
            },
            "result": true
        }
    }
}