Nanotechnology Promises Much

    @stdlib/math-base-special-inv
    TypeScript icon, indicating that this package has built-in type declarations

    0.0.7 • Public • Published

    inv

    NPM version Build Status Coverage Status dependencies

    Compute the multiplicative inverse of a double-precision floating-point number.

    The multiplicative inverse (or reciprocal) is defined as

    Multiplicative inverse

    Installation

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

    Usage

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

    inv( x )

    Computes the multiplicative inverse of a double-precision floating-point number x.

    var v = inv( -1.0 );
    // returns -1.0
    
    v = inv( 2.0 );
    // returns 0.5
    
    v = inv( 0.0 );
    // returns Infinity
    
    v = inv( -0.0 );
    // returns -Infinity
    
    v = inv( NaN );
    // returns NaN

    Examples

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

    C APIs

    Installation

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

    Usage

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

    stdlib_base_inv( x )

    Computes the multiplicative inverse of a double-precision floating-point number.

    double y = stdlib_base_inv( 2.0 );
    // returns 0.5

    The function accepts the following arguments:

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

    Examples

    #include "stdlib/math/base/special/inv.h"
    #include <stdio.h>
    
    int main() {
        double x[] = { 3.0, 4.0, 5.0, 12.0 };
    
        double y;
        int i;
        for ( i = 0; i < 4; i++ ) {
            y = stdlib_base_inv( x[ i ] );
            printf( "inv(%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.

    Community

    Chat


    License

    See LICENSE.

    Copyright

    Copyright © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/math-base-special-inv

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    13

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    52.1 kB

    Total Files

    17

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser