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catanl (3)
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 atan(). 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)).
CONFORMING TO
C99
SEE ALSO
ccos(3), clog(3), complex(7)
2002-07-28 CATAN(3)
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