Developer's Daily | Unix by Example |
main | java | perl | unix | dev directory | web log |
atanh ? inverse hyperbolic tangent function |
#include <math.h> double atanh(double x); |
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 |
asinh(3), acosh(3), cosh(3), sinh(3), tanh(3) |