math-beta

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beta

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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.

Copyright

Copyright © 2016. The Compute.io Authors.

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npm i math-beta

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Version

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