Originální popis anglicky:
atanh, atanhf, atanhl - inverse hyperbolic tangent function
Návod, kniha: Linux Programmer's Manual
#include <math.h>
double atanh(double x);
float atanhf(float x);
long double atanhl(long double x);
Link with -lm.
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,
acosh() returns
not-a-number (NaN) and
errno is set.
- EDOM
- x is out of range.
SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99
requirements.
acosh(3),
asinh(3),
cosh(3),
sinh(3),
tanh(3)
