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

catan, catanf, catanl - complex arc tangents

#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.

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))

These functions first appeared in glibc in version 2.1.

C99.

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

This page is part of release 3.21 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

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