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# npm

## @stdlib/math-base-special-sqrt

0.0.7 • Public • Published

# Square Root

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

The principal square root is defined as

## Installation

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

## Usage

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

#### sqrt( x )

Computes the principal square root of a double-precision floating-point number.

```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 is not defined.

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

## Examples

```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 ) );
}```

## Installation

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

### Usage

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

#### stdlib_base_sqrt( x )

Computes the principal square root of a double-precision floating-point number.

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

The function accepts the following arguments:

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

### Examples

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

int main() {
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 );
}
}```

## 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.

## Keywords

### Install

`npm i @stdlib/math-base-special-sqrt`

### Repository

github.com/stdlib-js/math-base-special-sqrt

stdlib.io

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0.0.7

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