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atanh

Syntax

 
#include <math.h>

double atanh(double x);

Description

This function computes the inverse hyperbolic tangent of x.

Return Value

The inverse hyperbolic tangent of x. If the the value of x is plus or minus 1, the return value is an Inf with the same sign as the argument x, and errno is set to ERANGE. If the absolute value of x is greater than 1, the return value is NaN and errno is set to EDOM.

Portability

ANSI/ISO C No
POSIX No


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