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

    Logarithm

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    Compute the base b logarithm.

    Installation

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

    Usage

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

    log( x, b )

    Computes the base b logarithm of x.

    var v = log( 100.0, 10.0 );
    // returns 2.0
    
    v = log( 16.0, 2.0 );
    // returns 4.0
    
    v = log( 5.0, 1.0 );
    // returns Infinity

    For negative x or b, the logarithm is not defined.

    var v = log( -4.0, 1.0 );
    // returns NaN
    
    v = log( 2.0, -4.0 );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var log = require( '@stdlib/math-base-special-log' );
    
    var b;
    var x;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        x = round( randu() * 100.0 );
        b = round( randu() * 5.0 );
        console.log( 'log( %d, %d ) = %d', x, b, log( x, b ) );
    }

    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-log

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    16

    Version

    0.0.5

    License

    Apache-2.0

    Unpacked Size

    35.6 kB

    Total Files

    9

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser