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    @stdlib/math-base-ops-cneg
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    0.0.5 • Public • Published

    Negate

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    Negate a complex number.

    Installation

    npm install @stdlib/math-base-ops-cneg

    Usage

    var cneg = require( '@stdlib/math-base-ops-cneg' );

    cneg( [out,] re, im )

    Negates a complex number comprised of a real component re and an imaginary component im.

    var v = cneg( -4.2, 5.5 );
    // returns [ 4.2, -5.5 ]
    
    v = cneg( 0.0, 0.0 );
    // returns [ -0.0, -0.0 ]
    
    v = cneg( NaN, NaN );
    // returns [ NaN, NaN ]

    By default, the function returns real and imaginary components 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 = cneg( out, -4.2, 5.5 );
    // returns <Float64Array>[ 4.2, -5.5 ]
    
    var bool = ( v === out );
    // returns true

    Examples

    var Complex128 = require( '@stdlib/complex-float64' );
    var randu = require( '@stdlib/random-base-randu' );
    var real = require( '@stdlib/complex-real' );
    var imag = require( '@stdlib/complex-imag' );
    var cneg = require( '@stdlib/math-base-ops-cneg' );
    
    var re;
    var im;
    var z;
    var o;
    var w;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        re = ( randu()*100.0 ) - 50.0;
        im = ( randu()*100.0 ) - 50.0;
        z = new Complex128( re, im );
        o = cneg( real(z), imag(z) );
        w = new Complex128( o[ 0 ], o[ 1 ] );
        console.log( 'negate(%s) = %s', z.toString(), w.toString() );
    }

    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-ops-cneg

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    18

    Version

    0.0.5

    License

    Apache-2.0

    Unpacked Size

    40.1 kB

    Total Files

    11

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