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Function std.math.trigonometry.acos
Calculates the arc cosine of x, returning a value ranging from 0 to π.
real acos
(
real x
) pure nothrow @nogc @safe;
double acos
(
double x
) pure nothrow @nogc @safe;
float acos
(
float x
) pure nothrow @nogc @safe;
x | acos(x) | invalid? |
---|---|---|
>1.0 | NAN | yes |
<-1.0 | NAN | yes |
NAN | NAN | yes |
Example
import std .math .operations : isClose;
import std .math .traits : isNaN;
import std .math .constants : PI;
assert(acos(0.0) .isClose(1.570796327));
assert(acos(0.5) .isClose(PI / 3));
assert(acos(PI) .isNaN);
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.