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

    Absolute Value

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    Compute an absolute value of a signed 32-bit integer.

    The absolute value is defined as

    Absolute value

    Installation

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

    Usage

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

    labs( x )

    Computes an absolute value of a signed 32-bit integer.

    var v = labs( -1|0 );
    // returns 1
    
    v = labs( 2|0 );
    // returns 2
    
    v = labs( 0|0 );
    // returns 0

    Notes

    • The implementation assumes two's complement.

    • In two's complement systems, the absolute value of the minimum signed 32-bit integer is out-of-range. The absolute value for the minimum signed 32-bit integer is thus undefined.

      // -2^31
      var x = -2147483648|0;
      
      var v = labs( x );
      // returns -2147483648

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var round = require( '@stdlib/math-base-special-round' );
    var labs = require( '@stdlib/math-base-special-labs' );
    
    var x;
    var i;
    
    for ( i = 0; i < 100; i++ ) {
        x = round( randu() * 100.0 ) - 50;
        console.log( 'abs(%d) = %d', x, labs( x|0 ) );
    }

    C APIs

    Installation

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

    Usage

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

    stdlib_base_labs( x )

    Computes the absolute value of a signed 32-bit integer in two's complement format.

    #include <stdint.h>
    
    int32_t y = stdlib_base_labs( -5 );
    // returns 5

    The function accepts the following arguments:

    • x: [in] int32_t input value.
    int32_t stdlib_base_labs( const int32_t x );

    Examples

    #include "stdlib/math/base/special/labs.h"
    #include <stdint.h>
    #include <stdio.h>
    
    int main() {
        int32_t x[] = { 3, -3, 0, -10 };
    
        int32_t y;
        int i;
        for ( i = 0; i < 4; i++ ) {
            y = stdlib_base_labs( x[ i ] );
            printf( "|%i| = %i\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-labs

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    21

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    56.3 kB

    Total Files

    17

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser