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Function std.math.trigonometry.acosh
Calculates the inverse hyperbolic cosine of x.
real acosh
(
real x
) pure nothrow @nogc @safe;
double acosh
(
double x
) pure nothrow @nogc @safe;
float acosh
(
float x
) pure nothrow @nogc @safe;
Mathematically, acosh(x) = log(x + sqrt( x*x - 1))
Domain X | Range Y |
---|---|
1..∞ | 0..∞ |
x | acosh(x) |
---|---|
NAN | NAN |
<1 | NAN |
1 | 0 |
+∞ | +∞ |
Example
import std .math .traits : isIdentical, isNaN;
assert(isNaN(acosh(0.9)));
assert(isNaN(acosh(real .nan)));
assert(isIdentical(acosh(1.0), 0.0));
writeln(acosh(real .infinity)); // real.infinity
assert(isNaN(acosh(0.5)));
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.