ATANH(3) NEWLIB ATANH(3)NAME
1.9 `atanh', `atanhf'--inverse hyperbolic tangent
SYNOPSIS
#include <math.h>
double atanh(double X);
float atanhf(float X);
DESCRIPTION
`atanh' calculates the inverse hyperbolic tangent of X.
`atanhf' is identical, other than taking and returning `float' val‐
ues.
RETURNS
`atanh' and `atanhf' return the calculated value.
If
X|
is greater than 1, the global `errno' is set to `EDOM' and the
result is a NaN. A `DOMAIN error' is reported.
If
X|
is 1, the global `errno' is set to `EDOM'; and the result is infin‐
ity with the same sign as `x'. A `SING error' is reported.
You can modify the error handling for these routines using `math‐
err'.
PORTABILITY
Neither `atanh' nor `atanhf' are ANSI C.
SEE ALSOatanh is part of the library. The full documentation for is maintained
as a Texinfo manual. If info and are properly installed at your site,
the command
info
will give you access to the complete manual.
NEWLIB April 2010 ATANH(3)
