Package Exports

math-beta

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Readme

beta

$NPM version$ $Build Status$ $Coverage Status$ $Dependencies$

Beta function.

The Beta function, also called the Euler integral, is defined as

$Equation for the beta function.$

It is related to the Gamma function via the following equation

$Beta function expressed in terms of the Gamma function.$

Installation

$ npm install math-beta

Usage

var beta = require( 'math-beta' );

beta( x, y )

Evaluates the the Beta function.

var val = beta( 0, 0 );
// returns +Infinity

val = beta( 1, 1 );
// returns 1

val = beta( -1, 2 );
// return NaN

val = beta( 5, 0.2 );
// returns ~3.382

val = beta( 4, 1 );
// returns 0.25

Examples

var beta = require( 'math-beta' );

for ( var x = 0; x < 10; x++ ) {
    for ( var y = 10; y > 0; y-- ) {
        console.log( 'x: %d, \t y: %d, \t f(x,y): %d', x, y, beta( x, y ) );
    }
}

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

Browser Support

This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:

$ make test-browsers

To view the tests in a local web browser,

$ make view-browser-tests

License

MIT license.

math-beta