@stdlib/math-base-special-invf NPM

invf

$NPM version$ $Build Status$ $Coverage Status$

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

The multiplicative inverse (or reciprocal) is defined as

Installation

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

Usage

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

invf( x )

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

var v = invf( -1.0 );
// returns -1.0

v = invf( 2.0 );
// returns 0.5

v = invf( 0.0 );
// returns Infinity

v = invf( -0.0 );
// returns -Infinity

v = invf( NaN );
// returns NaN

Examples

var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var invf = require( '@stdlib/math-base-special-invf' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = round( randu()*100.0 ) - 50.0;
    console.log( 'invf(%d) = %d', x, invf( x ) );
}

C APIs

Usage

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

stdlib_base_invf( x )

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

float y = stdlib_base_invf( 2.0f );
// returns 0.5f

The function accepts the following arguments:

x: [in] float input value.

float stdlib_base_inv( const float x );

Examples

#include "stdlib/math/base/special/invf.h"
#include <stdio.h>

int main( void ) {
    const float x[] = { 3.0f, 4.0f, 5.0f, 12.0f };

    float y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_invf( x[ i ] );
        printf( "inv(%f) = %f\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.