@stdlib/math-base-special-atan2
Advanced tools
Compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
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Compute the angle in the plane (in radians) between the positive x-axis and the ray from
(0,0)to the point(x,y).
npm install @stdlib/math-base-special-atan2
var atan2 = require( '@stdlib/math-base-special-atan2' );
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
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 ) );
}
#include "stdlib/math/base/special/atan2.h"
Computes the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
double out = stdlib_base_atan2( 2.0, 2.0 );
// returns ~0.785
out = stdlib_base_atan2( 6.0, 2.0 );
// returns ~1.249
The function accepts the following arguments:
[in] double - y coordinate[in] double - x coordinatedouble stdlib_base_atan2( const double y, const double x );
#include "stdlib/math/base/special/atan2.h"
#include <stdlib.h>
#include <stdio.h>
int main( void ) {
double y;
double x;
double v;
int i;
for ( i = 0; i < 100; i++ ) {
y = ( ( (double)rand() / (double)RAND_MAX ) * 100.0 );
x = ( ( (double)rand() / (double)RAND_MAX ) * 100.0 );
v = stdlib_base_atan2( y, x );
printf( "atan2(%lf, %lf) = %lf\n", y, x, v );
}
return 0;
}
@stdlib/math-base/special/atan: compute the arctangent of a double-precision floating-point number.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.
Copyright © 2016-2024. The Stdlib Authors.
0.3.0 (2024-07-28)
<section class="features">1cf574b - add C implementation for math/base/special/atan255ec8ed - docs: remove comment (by Athan Reines)2777e4b - bench: resolve lint errors in benchmarks (by Athan Reines)189c569 - docs: update related packages sections (#2194) (by stdlib-bot)41d41e9 - test: include trailing newlines in Julia-generated JSON fixtures (by Philipp Burckhardt)9ed7d0e - chore: add missing trailing newlines (by Philipp Burckhardt)a258a50 - chore: update package meta data (#2087) (by stdlib-bot, Philipp Burckhardt)1cf574b - feat: add C implementation for math/base/special/atan2 (by Pushpendra Chandravanshi, stdlib-bot, Philipp Burckhardt, Pranav Goswami)A total of 4 people contributed to this release. Thank you to the following contributors:
FAQs
Compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
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