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NAME
atanh, atanhf, atanhl - inverse hyperbolic tangent function
SYNOPSIS
#include <math.h>
double atanh(double x );
float atanhf(float x );
long double atanhl(long double x );
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros (7)):
Feature Test Macro Requirements for glibc (see
feature_test_macros (7)):
atanh () atanhf () atanhl (): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or
cc\ -std=c99
DESCRIPTION
The atanh () function calculates the inverse
hyperbolic tangent of x; that is the value whose hyperbolic tangent
is x. If the absolute value of x is
greater than 1.0, atanh () returns not-a-number (NaN) and errno is set.
ERRORS
EDOM x is out of range.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C89. The float and
long double variants are C99 requirements.
SEE ALSO
acosh (3) asinh (3)
catanh (3) cosh (3) sinh (3) tanh (3)
