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mul

Multiply two double-precision floating-point numbers.

Installation

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

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

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

mul( x, y )

Multiplies two double-precision floating-point numbers.

var v = mul( -1.0, 5.0 );
// returns -5.0

v = mul( 2.0, 5.0 );
// returns 10.0

v = mul( 0.0, 5.0 );
// returns 0.0

v = mul( -0.0, 0.0 );
// returns -0.0

v = mul( NaN, NaN );
// returns NaN

Examples

var rand = require( '@stdlib/random-base-discrete-uniform' );
var mul = require( '@stdlib/math-base-ops-mul' );

var x;
var y;
var i;

for ( i = 0; i < 100; i++ ) {
    x = rand( -50, 50 );
    y = rand( -50, 50 );
    console.log( '%d x %d = %d', x, y, mul( x, y ) );
}

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C APIs

Usage

#include "stdlib/math/base/ops/mul.h"

stdlib_base_mul( x, y )

Multiplies two double-precision floating-point numbers.

double v = stdlib_base_mul( -5.0, 2.0 );
// returns -10.0

The function accepts the following arguments:

• x: [in] double first input value.
• y: [in] double second input value.

double stdlib_base_mul( const double x, const double y );

Examples

#include "stdlib/math/base/ops/mul.h"
#include <stdio.h>

int main( void ) {
    const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
    const double y[] = { 3.14, -3.14, -0.0, 0.0/0.0 };

    double z;
    int i;
    for ( i = 0; i < 4; i++ ) {
        z = stdlib_base_mul( x[ i ], y[ i ] );
        printf( "%lf x %lf = %lf\n", x[ i ], y[ i ], z );
    }
}

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See Also

• @stdlib/math-base/ops/add: compute the sum of two double-precision floating-point numbers.
• @stdlib/math-base/ops/div: divide two double-precision floating-point numbers.
• @stdlib/math-base/ops/sub: subtract two double-precision floating-point numbers.

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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

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.