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.
CONFORMING TO
C99.
SEE ALSO
atanh(3), cabs(3), cimag(3), complex(7)
COLOPHON
- This page is part of release 3.25 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/.