@stdlib/math-base-special-powm1
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    0.0.5 • Public • Published

    powm1

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    Evaluate bˣ - 1.

    Exponential function minus one

    When b is close to 1 and/or x is small, this implementation is more accurate than naively computing minus 1.

    Installation

    npm install @stdlib/math-base-special-powm1

    Usage

    var powm1 = require( '@stdlib/math-base-special-powm1' );

    powm1( b, x )

    Evaluates bˣ - 1.

    var y = powm1( 2.0, 3.0 );
    // returns 7.0
    
    y = powm1( 4.0, 0.5 );
    // returns 1.0
    
    y = powm1( 0.0, 100.0 );
    // returns -1.0
    
    y = powm1( 100.0, 0.0 );
    // returns 0.0
    
    y = powm1( 0.0, 0.0 );
    // returns 0.0
    
    y = powm1( 3.141592653589793, 5.0 );
    // returns ~305.0197
    
    y = powm1( NaN, 3.0 );
    // returns NaN
    
    y = powm1( 5.0, NaN );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var powm1 = require( '@stdlib/math-base-special-powm1' );
    
    var b;
    var x;
    var y;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        b = round( randu()*10.0 );
        x = round( randu()*10.0 ) - 5.0;
        y = powm1( b, x );
        console.log( '%d^%d - 1 = %d', b, x, y );
    }

    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-powm1

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    339

    Version

    0.0.5

    License

    Apache-2.0 AND BSL-1.0

    Unpacked Size

    42.3 kB

    Total Files

    10

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser