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atanh | Function (ROM Call 0x289*) |
math.h, timath.h |
float atanh (float x); |
Floating point hyperbolic area tangent.
atanh returns the hyperbolic area tangent of floating point argument x.
The hyperbolic area tangent is defined as log((1+x)/(1-x))/2.
Note: atanh will return NAN if x is smaller than -1
or greater than 1. Also, it will return POSITIVE_INF
if x is 1, and NEGATIVE_INF if x is -1.