@stdlib/math-base-special-cosm1
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    0.0.5 • Public • Published

    cosm1

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    Compute cos(x) - 1.

    Installation

    npm install @stdlib/math-base-special-cosm1

    Usage

    var cosm1 = require( '@stdlib/math-base-special-cosm1' );

    cosm1( x )

    Computes cos(x) - 1, where cos is the cosine of a number (in radians). This function should be used instead of manually calculating cos(x) - 1 when the argument is near unity.

    var PI = require( '@stdlib/constants-float64-pi' );
    
    var v = cosm1( 0.0 );
    // returns 0.0
    
    v = cosm1( PI/4.0 );
    // returns ~-0.293
    
    v = cosm1( -PI/6.0 );
    // returns ~-0.134
    
    v = cosm1( NaN );
    // returns NaN

    Examples

    var linspace = require( '@stdlib/array-linspace' );
    var PI = require( '@stdlib/constants-float64-pi' );
    var cosm1 = require( '@stdlib/math-base-special-cosm1' );
    
    var x = linspace( 0.0, 2.0*PI, 100 );
    var i;
    
    for ( i = 0; i < x.length; i++ ) {
        console.log( cosm1( x[ i ] ) );
    }

    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-cosm1

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    20

    Version

    0.0.5

    License

    Apache-2.0

    Unpacked Size

    37.8 kB

    Total Files

    10

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser