Newton's Poleless Magnet

    math-gamma

    1.0.2 • Public • Published

    Gamma Function

    NPM version Build Status Coverage Status Dependencies

    Gamma function.

    The gamma function extends the factorial function to real and complex numbers. If n is a positive integer,

    Gamma function for positive intgers.

    Generalized to all complex numbers z, except for non-positive integers, the gamma function can be expressed as an infinite product

    Gamma function for all complex numbers.

    where γ ≈ 0.577216 is the Euler–Mascheroni constant.

    Installation

    $ npm install math-gamma

    Usage

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

    gamma( x )

    Evaluates the gamma function.

    var val = gamma( 4 );
    // returns 3! = 6
     
    val = gamma( -3/2 );
    // returns ~2.363
     
    val = gamma( -1/2 );
    // returns ~-3.545
     
    val = gamma( 1/2 );
    // returns ~1.772

    Examples

    var linspace = require( 'compute-linspace' );
    var gamma = require( 'math-gamma' );
     
    var x = linspace( -10, 10, 100 );
    var v;
    var i;
     
    for ( i = 0; i < x.length; i++ ) {
        v = gamma( x[ i ] );
        console.log( 'x: %d, f(x): %d', x[ i ], v );
    }

    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.

    Install

    npm i math-gamma

    DownloadsWeekly Downloads

    32

    Version

    1.0.2

    License

    MIT

    Last publish

    Collaborators

    • kgryte
    • planeshifter