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)
