The OpenD Programming Language

atanh

Calculates the inverse hyperbolic tangent of x, returning a value from ranging from -1 to 1.

Mathematically, atanh(x) = log( (1+x)/(1-x) ) / 2

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Special Values
x	acosh(x)
NaN	NaN
±0	±0
-∞	-0

real atanh(real x)
double atanh(double x)
float atanh(float x)
@safe pure nothrow @nogc
float
atanh
(
float x
)

Examples

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)));
assert(atanh(0.0) == 0);

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std math trigonometry functions