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    @stdlib/math-base-special-trigamma
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    0.0.5 • Public • Published

    Trigamma

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    Trigamma function.

    The trigamma function ψ^(1) is the derivative of the digamma function.

    Trigamma function

    Installation

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

    Usage

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

    trigamma( x )

    Evaluates the trigamma function.

    var v = trigamma( -2.5 );
    // returns ~9.539
    
    v = trigamma( 1.0 );
    // returns ~1.645
    
    v = trigamma( 10.0 );
    // returns ~0.105

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

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

    If provided NaN, the function returns NaN.

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

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var trigamma = require( '@stdlib/math-base-special-trigamma' );
    
    var x;
    var v;
    var i;
    
    for ( i = 0; i < 10; i++ ) {
        x = (randu()*100.0) - 50.0;
        v = trigamma( x );
        console.log( 'x: %d, ψ^(1)(x): %d', x, v );
    }

    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 © 2016-2021. The Stdlib Authors.

    Install

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

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    7

    Version

    0.0.5

    License

    Apache-2.0 AND BSL-1.0

    Unpacked Size

    62.3 kB

    Total Files

    15

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser