ATANH

Section: Linux Programmer's Manual (3)
Updated: 2002-07-27
Index Return to Main Contents
 

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.  

DESCRIPTION

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, atanh() returns not-a-number (NaN) and errno is set.  

ERRORS

EDOM
x is out of range.
 

CONFORMING TO

SVr4, POSIX.1-2001, 4.3BSD, C89. The float and long double variants are C99 requirements.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
ERRORS
CONFORMING TO
SEE ALSO

linux.jgfs.net manual pages