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Function std.math.trigonometry.atanh
Calculates the inverse hyperbolic tangent of x, returning a value from ranging from -1 to 1.
real atanh
(
real x
) pure nothrow @nogc @safe;
double atanh
(
double x
) pure nothrow @nogc @safe;
float atanh
(
float x
) pure nothrow @nogc @safe;
Mathematically, atanh(x) = log( (1+x)/(1-x) ) / 2
Domain X | Range Y |
---|---|
-∞..∞ | -1 .. 1 |
x | acosh(x) |
---|---|
NAN | NAN |
±0 | ±0 |
-∞ | -0 |
Example
import std .math .traits : isIdentical, isNaN;
assert(isIdentical(atanh(0.0), 0.0));
assert(isIdentical(atanh(-0.0),-0.0));
assert(isNaN(atanh(real .nan)));
assert(isNaN(atanh(-real .infinity)));
writeln(atanh(0.0)); // 0
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.