CATAN(3)                                            Linux Programmer's Manual                                           CATAN(3)



NAME
       catan, catanf, catanl - complex arc tangents

SYNOPSIS
       #include <complex.h>

       double complex catan(double complex z);
       float complex catanf(float complex z);
       long double complex catanl(long double complex z);

       Link with -lm.

DESCRIPTION
       The  catan() function calculates the complex arc tangent of z.  If y = catan(z), then z = ctan(y).  The real part of y is
       chosen in the interval [-pi/2,pi/2].

       One has:

           catan(z) = 1 / 2i clog((1 + iz) / (1 - iz))

VERSIONS
       These functions first appeared in glibc in version 2.1.

CONFORMING TO
       C99.

SEE ALSO
       ccos(3), clog(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                                                   CATAN(3)