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Square Root

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Compute the principal [square root][square-root] of a double-precision floating-point number.

The principal [square root][square-root] is defined as

$Principal square root$

## Installation

bash
npm install @stdlib/math-base-special-sqrt

## Usage

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

#### sqrt( x ) Computes the principal [square root][square-root] of a double-precision floating-point number.

javascript
var v = sqrt( 4.0 );
// returns 2.0

v = sqrt( 9.0 );
// returns 3.0

v = sqrt( 0.0 );
// returns 0.0

v = sqrt( NaN );
// returns NaN

For negative numbers, the principal [square root][square-root] is not defined.

javascript
var v = sqrt( -4.0 );
// returns NaN

## Examples

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

var x;
var i;

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

## C APIs

### Usage

c
#include "stdlib/math/base/special/sqrt.h"

#### stdlib_base_sqrt( x ) Computes the principal [square root][square-root] of a double-precision floating-point number.

c
double y = stdlib_base_sqrt( 9.0 );
// returns 3.0

The function accepts the following arguments: - x: [in] double input value.

c
double stdlib_base_sqrt( const double x );

### Examples

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

int main( void ) {
    const double x[] = { 3.14, 9.0, 0.0, 0.0/0.0 };

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

* ## See Also - [@stdlib/math-base/special/cbrt][@stdlib/math/base/special/cbrt]: compute the cube root of a double-precision floating-point number. - [@stdlib/math-base/special/rsqrt][@stdlib/math/base/special/rsqrt]: compute the reciprocal square root of a double-precision floating-point number.

* ## Notice This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib]. #### Community [![Chat][chat-image]][chat-url] --- ## License See [LICENSE][stdlib-license]. ## Copyright Copyright © 2016-2024. The Stdlib [Authors][stdlib-authors].

Détail du package

readme

Square Root