Manpage of ATANH

ATANH

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

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)):

atanh():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
    || _XOPEN_SOURCE >= 500
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

atanhf(), atanhl():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 

DESCRIPTION

These functions calculate the inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x.  

RETURN VALUE

On success, these functions return the inverse hyperbolic tangent of x.

If xis a NaN, a NaN is returned.

If xis +0 (-0), +0 (-0) is returned.

If xis +1 or -1, a pole error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with the mathematically correct sign.

If the absolute value of xis greater than 1, a domain error occurs, and a NaN is returned.  

ERRORS

See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Domain error: x less than -1 or greater than +1
errnois set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.
Pole error: x is +1 or -1
errnois set to ERANGE(but see BUGS). A divide-by-zero floating-point exception (FE_DIVBYZERO) is raised.
 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
atanh(), atanhf(), atanhl() Thread safetyMT-Safe
 

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

The variant returning doublealso conforms to SVr4, 4.3BSD, C89.  

BUGS

In glibc 2.9 and earlier, when a pole error occurs, errnoas set to EDOMinstead of the POSIX-mandated ERANGE. Since version 2.10, glibc does the right thing.  

SEE ALSO

acosh(3), asinh(3), catanh(3), cosh(3), sinh(3), tanh(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
BUGS
SEE ALSO

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