CATANH

Section: complex math routines (3)
Updated: 2002-07-28
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NAME

catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS

#include <complex.h>

double complex catanh(double complex z);
float complex catanhf(float complex z);
long double complex catanhl(long double complex z);

Link with -lm.

DESCRIPTION

The catanh() function calculates the complex atanh(). If y = catanh(z), then z = ctanh(y). The imaginary part of y is chosen in the interval [-pi/2,pi/2].

One has catanh(z) = 0.5*clog((1+z)/(1-z)).

CONFORMING TO

C99