@stdlib/math-base-special-identity
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    0.0.7 • Public • Published

    Identity Function

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    Evaluate the identity function of a double-precision floating-point number.

    The identity-function is defined as

    Identity function

    for all x.

    Installation

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

    Usage

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

    identity( x )

    Evaluates the identity function for a double-precision floating-point number.

    var v = identity( -1.0 );
    // returns -1.0
    
    v = identity( 2.0 );
    // returns 2.0
    
    v = identity( 0.0 );
    // returns 0.0
    
    v = identity( -0.0 );
    // returns -0.0
    
    v = identity( NaN );
    // returns NaN

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var identity = require( '@stdlib/math-base-special-identity' );
    
    var rand;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        rand = round( randu() * 100.0 ) - 50.0;
        console.log( 'identity(%d) = %d', rand, identity( rand ) );
    }

    C APIs

    Installation

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

    Usage

    #include "stdlib/math/base/special/identity.h"

    stdlib_base_identity( x )

    Evaluates the identity function for a double-precision floating-point number.

    double y = stdlib_base_identity( 2.0 );
    // returns 2.0

    The function accepts the following arguments:

    • x: [in] double input value.
    double stdlib_base_identity( const double x );

    Examples

    #include "stdlib/math/base/special/identity.h"
    #include <stdio.h>
    
    int main() {
        double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
    
        double y;
        int i;
        for ( i = 0; i < 4; i++ ) {
            y = stdlib_base_identity( x[ i ] );
            printf( "f(%lf) = %lf\n", x[ i ], 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-identity

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    20

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    52.3 kB

    Total Files

    17

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser