Display the source code in std/math/trigonometry.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function `std.math.trigonometry.atan2`

Calculates the arc tangent of y / x, returning a value ranging from -π to π.


						
				real atan2
				(
				

				  real y,
				

				  real x
				

				) pure nothrow @nogc @trusted;
				

				

				double atan2
				(
				

				  double y,
				

				  double x
				

				) pure nothrow @nogc @safe;
				

				

				float atan2
				(
				

				  float y,
				

				  float x
				

				) pure nothrow @nogc @safe;

Special Values
y	x	atan(y, x)
NAN	anything	NAN
anything	NAN	NAN
±0.0	>0.0	±0.0
±0.0	+0.0	±0.0
±0.0	<0.0	±π
±0.0	-0.0	±π
>0.0	±0.0	π/2
<0.0	±0.0	-π/2
>0.0	∞	±0.0
±∞	anything	±π/2
>0.0	-∞	±π
±∞	∞	±π/4
±∞	-∞	±3π/4

Example

import std.math.operations : isClose;
import std.math.constants : PI;
import std.math.algebraic : sqrt;

assert(atan2(1.0, sqrt(3.0)).isClose(PI / 6));

Authors

Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger

License

Boost License 1.0.