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.

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/.



                                                           2008-08-11                                                  CATANH(3)