CATANH(3) Linux Programmer s Manual CATANH(3)

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.


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

COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at

2008-08-11 CATANH(3)