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#include <math.h> double atanh(double x); |
This function computes the inverse hyperbolic tangent of x.
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
.
ANSI/ISO C | No |
POSIX | No |
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Copyright © 2004 by DJ Delorie | Updated Apr 2004 |