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 3.24 of the Linux man-pages project. A description of the project, and informa-
tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
2008-08-11
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