Jump to content United States-English
HP.com Home Products and Services Support and Drivers Solutions How to Buy
» Contact HP
More options
HP.com home
HP-UX Reference > A

atanh(3M)

HP-UX 11i Version 3: February 2007
» 

Technical documentation

» Feedback
Content starts here

 » Table of Contents

 » Index

NAME

atanh(), atanhf(), atanhl(), atanhw(), atanhq() — arc hyperbolic tangent functions

SYNOPSIS

#include <math.h>

double atanh(double x);

HP Integrity Server Only

float atanhf(float x);

long double atanhl(long double x);

extended atanhw(extended x);

quad atanhq(quad x);

DESCRIPTION

atanh() returns the arc hyperbolic tangent of x.

Integrity Server Only

atanhf() is a float version of atanh(); it takes a float argument and returns a float result.

atanhl() is a long double version of atanh(); it takes a long double argument and returns a long double result.

atanhw() is an extended version of atanh(); it takes an extended argument and returns an extended result.

atanhq() is equivalent to atanhl() on HP-UX systems.

USAGE

To use (for Integrity servers) atanhf(), atanhl(), atanhw(), or atanhq(), compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options.

To use (for Integrity servers) atanhw() or atanhq(), compile also with the -fpwidetypes option.

To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp.

RETURN VALUE

atanh(±0) returns ±0.

atanh(±1) returns ±Inf and raises the divide-by-zero floating-point exception.

If |x| > 1.0, atanh() returns NaN and raises the invalid exception.

If x is NaN, atanh() returns NaN.

When it raises no other exception, whether atanh() raises the inexact exception is unspecified.

ERRORS

If |x| > 1.0, atanh() sets errno to [EDOM].

Integrity Server Only

HP-UX libm functions on Integrity server do not set errno by default. For errno setting, compile with the +Olibmerrno option.

STANDARDS CONFORMANCE

atanh(), atanhf(), atanhl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

Printable version
Privacy statement Using this site means you accept its terms Feedback to webmaster
© 1983-2007 Hewlett-Packard Development Company, L.P.