@stdlib/assert-is-probability-array NPM

isProbabilityArray

Test if a value is an array-like object containing only probabilities.

A probability is defined as a numeric value on the interval [0,1].

Installation

npm install @stdlib/assert-is-probability-array

Usage

var isProbabilityArray = require( '@stdlib/assert-is-probability-array' );

isProbabilityArray( value )

Tests if a value is an array-like object containing only probabilities.

var Number = require( '@stdlib/number-ctor' );
var Uint8Array = require( '@stdlib/array-uint8' );

var bool = isProbabilityArray( [ 0.6, 0.5, 0.25 ] );
// returns true

bool = isProbabilityArray( [ 0.6, 0.5, new Number( 0.25 ) ] );
// returns true

bool = isProbabilityArray( new Uint8Array( [ 0, 1 ] ) );
// returns true

bool = isProbabilityArray( [ 3.14, 0.0 ] );
// returns false

isProbabilityArray.primitives( value )

Tests if a value is an array-like object array containing only primitive probabilities.

var Number = require( '@stdlib/number-ctor' );

var bool = isProbabilityArray.primitives( [ 1.0, 0.0, 0.8 ] );
// returns true

bool = isProbabilityArray.primitives( [ 0.9, new Number(1.0) ] );
// returns false

isProbabilityArray.objects( value )

Tests if a value is an array-like object array containing only Number objects whose values are probabilities.

var Number = require( '@stdlib/number-ctor' );

var bool = isProbabilityArray.objects( [ new Number(1.0), new Number(1.0) ] );
// returns true

bool = isProbabilityArray.objects( [ 1.0, 0.0, 0.6 ] );
// returns false

Examples

var Uint8Array = require( '@stdlib/array-uint8' );
var isProbabilityArray = require( '@stdlib/assert-is-probability-array' );

var arr = [ 0.0, 1.0, 0.5 ];
var bool = isProbabilityArray( arr );
// returns true

arr = [ 0.5, 0.25, 0.25 ];
bool = isProbabilityArray( arr );
// returns true

arr = new Uint8Array( [ 0, 0, 1, 0, 1 ] );
bool = isProbabilityArray( arr );
// returns true

arr = [ 3.14, -1.0 ];
bool = isProbabilityArray( arr );
// returns false

bool = isProbabilityArray( [] );
// returns false

bool = isProbabilityArray( null );
// returns false

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.