NAME | SYNOPSIS | DESCRIPTION | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

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

NAME         top

       catan, catanf, catanl - complex arc tangents

SYNOPSIS         top

       #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         top

       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         top

       These functions first appeared in glibc in version 2.1.

CONFORMING TO         top

       C99.

SEE ALSO         top

       ccos(3), clog(3), complex(7)

COLOPHON         top

       This page is part of release 3.32 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)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface