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

    sici

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    Compute the sine and cosine integrals.

    The sine integral is defined as

    Sine integral.

    and the cosine integral is defined as

    Cosine integral.

    where γ is the Euler-Mascheroni constant.

    Installation

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

    Usage

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

    sici( [out,] x )

    Computes the sine and cosine integrals.

    var v = sici( 3.0 );
    // returns [ ~1.849, ~0.12 ]
    
    v = sici( 0.0 );
    // returns [ 0.0, -Infinity ]
    
    v = sici( -9.0 );
    // returns [ ~-1.665, ~0.055 ]
    
    v = sici( NaN );
    // returns [ NaN, NaN ]

    By default, the function returns the sine and cosine integrals as a two-element array. To avoid unnecessary memory allocation, the function supports providing an output (destination) object.

    var Float64Array = require( '@stdlib/array-float64' );
    
    var out = new Float64Array( 2 );
    
    var v = sici( out, 3.0 );
    // returns <Float64Array>[ ~1.849, ~0.12 ]
    
    var bool = ( v === out );
    // returns true

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var sici = require( '@stdlib/math-base-special-sici' );
    
    var x;
    var y;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        x = randu() * 100.0;
        y = sici( x );
        console.log( 'si(%d) = %d, ci(%d) = %d', x, y[ 0 ], x, y[ 1 ] );
    }

    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-sici

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    2

    Version

    0.0.5

    License

    Apache-2.0

    Unpacked Size

    76.1 kB

    Total Files

    24

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser