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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
These functions calculate 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) - clog(1 - z))
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-------------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------------+---------------+---------+ |catanh(), catanhf(), catanhl() | Thread safety | MT-Safe | +-------------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
EXAMPLE
/* Link with "-lm" */ #include <complex.h> #include <stdlib.h> #include <unistd.h> #include <stdio.h> int main(int argc, char *argv[]) { double complex z, c, f; if (argc != 3) { fprintf(stderr, "Usage: %s <real> <imag> ", argv[0]); exit(EXIT_FAILURE); } z = atof(argv[1]) + atof(argv[2]) * I; c = catanh(z); printf("catanh() = %6.3f %6.3f*i ", creal(c), cimag(c)); f = 0.5 * (clog(1 + z) - clog(1 - z)); printf("formula = %6.3f %6.3f*i ", creal(f2), cimag(f2)); exit(EXIT_SUCCESS); }
SEE ALSO
atanh(3), cabs(3), cimag(3), ctanh(3), complex(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2015-04-19 CATANH(3)
Related Man Pages
cacosh(3) - redhat
catanh(3) - redhat
catan(3) - minix
catan(3) - x11r4
catanh(3) - xfree86
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