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.atan`

Calculates the arc tangent of x, returning a value ranging from -π/2 to π/2.


						
				real atan
				(
				

				  real x
				

				) pure nothrow @nogc @safe;
				

				

				double atan
				(
				

				  double x
				

				) pure nothrow @nogc @safe;
				

				

				float atan
				(
				

				  float x
				

				) pure nothrow @nogc @safe;

Special Values
x	atan(x)	invalid?
±0.0	±0.0	no
±∞	NAN	yes

Example

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

assert(isIdentical(atan(0.0), 0.0));
assert(atan(sqrt(3.0)).isClose(PI / 3));

Authors

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

License

Boost License 1.0.