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added examples, package.json and fixed if statement flow #209 
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‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/examples/c/Makefile‎

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#/
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# @license Apache-2.0
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#
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# Copyright (c) 2025 The Stdlib Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#/
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# VARIABLES #
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ifndef VERBOSE
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QUIET := @
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else
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QUIET :=
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endif
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# Determine the OS ([1][1], [2][2]).
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#
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# [1]: https://en.wikipedia.org/wiki/Uname#Examples
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# [2]: http://stackoverflow.com/a/27776822/2225624
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OS ?= $(shell uname)
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ifneq (, $(findstring MINGW,$(OS)))
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OS := WINNT
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else
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ifneq (, $(findstring MSYS,$(OS)))
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OS := WINNT
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else
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ifneq (, $(findstring CYGWIN,$(OS)))
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OS := WINNT
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else
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ifneq (, $(findstring Windows_NT,$(OS)))
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OS := WINNT
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endif
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endif
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endif
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endif
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# Define the program used for compiling C source files:
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ifdef C_COMPILER
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CC := $(C_COMPILER)
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else
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CC := gcc
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endif
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# Define the command-line options when compiling C files:
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CFLAGS ?= \
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-std=c99 \
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-O3 \
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-Wall \
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-pedantic
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# Determine whether to generate position independent code ([1][1], [2][2]).
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#
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# [1]: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
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# [2]: http://stackoverflow.com/questions/5311515/gcc-fpic-option
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ifeq ($(OS), WINNT)
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fPIC ?=
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else
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fPIC ?= -fPIC
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endif
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# List of includes (e.g., `-I /foo/bar -I /beep/boop/include`):
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INCLUDE ?=
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# List of source files:
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SOURCE_FILES ?=
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# List of libraries (e.g., `-lopenblas -lpthread`):
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LIBRARIES ?=
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# List of library paths (e.g., `-L /foo/bar -L /beep/boop`):
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LIBPATH ?=
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# List of C targets:
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c_targets := example.out
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# RULES #
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#/
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# Compiles source files.
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#
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# @param {string} [C_COMPILER] - C compiler (e.g., `gcc`)
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# @param {string} [CFLAGS] - C compiler options
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# @param {(string|void)} [fPIC] - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
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# @param {string} [INCLUDE] - list of includes (e.g., `-I /foo/bar -I /beep/boop/include`)
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# @param {string} [SOURCE_FILES] - list of source files
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# @param {string} [LIBPATH] - list of library paths (e.g., `-L /foo/bar -L /beep/boop`)
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# @param {string} [LIBRARIES] - list of libraries (e.g., `-lopenblas -lpthread`)
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#
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# @example
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# make
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#
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# @example
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# make all
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#/
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all: $(c_targets)
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.PHONY: all
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#/
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# Compiles C source files.
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#
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# @private
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# @param {string} CC - C compiler (e.g., `gcc`)
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# @param {string} CFLAGS - C compiler options
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# @param {(string|void)} fPIC - compiler flag determining whether to generate position independent code (e.g., `-fPIC`)
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# @param {string} INCLUDE - list of includes (e.g., `-I /foo/bar`)
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# @param {string} SOURCE_FILES - list of source files
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# @param {string} LIBPATH - list of library paths (e.g., `-L /foo/bar`)
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# @param {string} LIBRARIES - list of libraries (e.g., `-lopenblas`)
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#/
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$(c_targets): %.out: %.c
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$(QUIET) $(CC) $(CFLAGS) $(fPIC) $(INCLUDE) -o $@ $(SOURCE_FILES) $< $(LIBPATH) -lm $(LIBRARIES)
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#/
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# Runs compiled examples.
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#
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# @example
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# make run
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#/
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run: $(c_targets)
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$(QUIET) ./$<
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.PHONY: run
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#/
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# Removes generated files.
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#
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# @example
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# make clean
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#/
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clean:
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$(QUIET) -rm -f *.o *.out
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.PHONY: clean

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/examples/c/example.c‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "stdlib/stats/base/dists/wald/pdf.h"
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#include "stdlib/constants/float64/eps.h"
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#include <stdlib.h>
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#include <stdio.h>
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static double random_uniform( const double min, const double max ) {
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double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
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return min + ( v*(max-min) );
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}
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int main( void ) {
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double lambda;
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double mu;
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double x;
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double y;
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int i;
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for ( i = 0; i < 10; i++ ) {
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x = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 10.0 );
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mu = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 10.0 );
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lambda = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 10.0 );
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y = stdlib_base_dists_wald_pdf( x, mu, lambda );
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printf( "x: %lf, µ: %lf, λ: %lf, f(x;µ,λ): %lf\n", x, mu, lambda, y );
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}
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}

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/examples/index.js‎

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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2025 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var randu = require( '@stdlib/random/base/randu' );
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var pdf = require( './../lib' );
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var lambda;
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var mu;
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var x;
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var y;
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var i;
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for ( i = 0; i < 10; i++ ) {
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x = randu() * 10.0;
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mu = randu() * 10.0;
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lambda = randu() * 10.0;
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y = pdf( x, mu, lambda );
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console.log( 'x: %d, µ: %d, λ: %d, f(x;µ,λ): %d', x.toFixed( 4 ), mu.toFixed( 4 ), lambda.toFixed( 4 ), y.toFixed( 4 ) );
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}

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/lib/factory.js‎

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@@ -51,16 +51,12 @@ function factory( mu, lambda ) {
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var B;
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if (
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isnan( mu ) ||
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isnan( lambda )
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isnan( lambda ) ||
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mu <= 0.0 ||
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lambda < 0.0
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) {
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return constantFunction( NaN );
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}
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if ( mu <= 0.0 ) {
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return constantFunction( NaN );
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}
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if ( lambda < 0.0 ) {
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return constantFunction( NaN );
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}
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if ( lambda === 0.0 ) {
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return degenerate( mu );
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}

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/lib/main.js‎

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if (
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isnan( x ) ||
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isnan( mu ) ||
100-
isnan( lambda )
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isnan( lambda ) ||
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mu <= 0.0 ||
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lambda < 0.0
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) {
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return NaN;
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}
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if ( mu <= 0.0 ) {
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return NaN;
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}
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if ( lambda < 0.0 ) {
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return NaN;
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}
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if ( lambda === 0.0 ) {
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return ( x === mu ) ? PINF : 0.0;
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}

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/package.json‎

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{
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"name": "@stdlib/stats/base/dists/wald/pdf",
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"version": "0.0.0",
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"description": "Wald distribution probability density function (PDF).",
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"license": "Apache-2.0",
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"author": {
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"name": "The Stdlib Authors",
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"url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
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},
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"contributors": [
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{
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"name": "The Stdlib Authors",
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"url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
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}
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],
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"main": "./lib",
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"gypfile": true,
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"directories": {
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"benchmark": "./benchmark",
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"doc": "./docs",
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"example": "./examples",
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"include": "./include",
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"lib": "./lib",
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"src": "./src",
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"test": "./test"
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},
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"types": "./docs/types",
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"scripts": {},
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"homepage": "https://github.com/stdlib-js/stdlib",
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"repository": {
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"type": "git",
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"url": "git://github.com/stdlib-js/stdlib.git"
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},
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"bugs": {
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"url": "https://github.com/stdlib-js/stdlib/issues"
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},
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"dependencies": {},
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"devDependencies": {},
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"engines": {
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"node": ">=0.10.0",
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"npm": ">2.7.0"
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},
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"os": [
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"aix",
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"darwin",
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"freebsd",
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"linux",
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"macos",
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"openbsd",
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"sunos",
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"win32",
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"windows"
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],
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"keywords": [
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"stdlib",
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"stdmath",
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"statistics",
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"stats",
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"distribution",
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"dist",
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"continuous",
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"probability",
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"pdf",
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"wald",
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"inverse-gaussian",
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"inverse gaussian",
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"univariate"
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]
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}

‎lib/node_modules/@stdlib/stats/base/dists/wald/pdf/src/main.c‎

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if (
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stdlib_base_is_nan( x ) ||
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stdlib_base_is_nan( mu ) ||
45-
stdlib_base_is_nan( lambda )
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stdlib_base_is_nan( lambda ) ||
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mu <= 0.0 ||
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lambda < 0.0
4648
) {
4749
return 0.0/0.0; // NaN
4850
}
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if ( mu <= 0.0 ) {
50-
return 0.0/0.0; // NaN
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}
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if ( lambda < 0.0 ) {
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return 0.0/0.0; // NaN
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}
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if ( lambda == 0.0 ) {
5652
return ( x == mu ) ? STDLIB_CONSTANT_FLOAT64_PINF : 0.0;
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}

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