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 arc hyperbolic tangent of z. 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))

VERSIONS


These functions first appeared in glibc in version 2.1.

CONFORMING TO


C99.

SEE ALSO


atanh(3), cabs(3), cimag(3), complex(7)

COLOPHON


This page is part of release 3.23 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

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