@stdlib/math-base-special-digamma
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    0.0.6 • Public • Published

    digamma

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    Digamma function.

    The digamma function ψ is the logarithmic derivative of the gamma function, i.e.

    Digamma function

    Installation

    npm install @stdlib/math-base-special-digamma

    Usage

    var digamma = require( '@stdlib/math-base-special-digamma' );

    digamma( x )

    Evaluates the digamma function.

    var v = digamma( -2.5 );
    // returns ~1.103
    
    v = digamma( 1.0 );
    // returns ~-0.577
    
    v = digamma( 10.0 );
    // returns ~2.252

    If x is 0 or a negative integer, the function returns NaN.

    var v = digamma( 0.0 );
    // returns NaN
    
    v = digamma( -1.0 );
    // returns NaN
    
    v = digamma( -2.0 );
    // returns NaN

    If provided NaN, the function returns NaN.

    var v = digamma( NaN );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var digamma = require( '@stdlib/math-base-special-digamma' );
    
    var x;
    var v;
    var i;
    
    for ( i = 0; i < 10; i++ ) {
        x = (randu()*10.0) - 5.0;
        v = digamma( x );
        console.log( 'x: %d, f(x): %d', x, v );
    }

    See Also


    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.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/math-base-special-digamma

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    708

    Version

    0.0.6

    License

    Apache-2.0 AND BSL-1.0

    Unpacked Size

    55.6 kB

    Total Files

    14

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser