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# npm

## @stdlib/math-base-special-atan2

0.0.6 • Public • Published

# atan2

Compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).

## Installation

npm install @stdlib/math-base-special-atan2

## Usage

var atan2 = require( '@stdlib/math-base-special-atan2' );

#### atan2( y, x )

Computes the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).

var v = atan2( 2.0, 2.0 ); // => atan(1.0)
// returns ~0.785

v = atan2( 6.0, 2.0 ); // => atan(3.0)
// returns ~1.249

v = atan2( -1.0, -1.0 ); // => atan(1.0) - π
// returns ~-2.356

v = atan2( 3.0, 0.0 ); // => π/2
// returns ~1.571

v = atan2( -2.0, 0.0 ); // => -π/2
// returns ~-1.571

v = atan2( 0.0, 0.0 );
// returns 0.0

v = atan2( 3.0, NaN );
// returns NaN

## Examples

var randu = require( '@stdlib/random-base-randu' );
var atan2 = require( '@stdlib/math-base-special-atan2' );

var y;
var x;
var i;

for ( i = 0; i < 100; i++ ) {
y = randu() * 100.0;
x = randu() * 100.0;
console.log( 'y: %d, \t x: %d, \t atan2(y,x): %d', y.toFixed( 4 ), x.toFixed( 4 ), atan2( y, x ).toFixed( 4 ) );
}

## 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-atan2

### Repository

github.com/stdlib-js/math-base-special-atan2

stdlib.io

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0.0.6

Apache-2.0

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