1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
2 .\" Distributed under GPL
4 .TH CATAN 3 2002-07-28 "" "complex math routines"
6 catan, catanf, catanl \- complex arc tangents
8 .B #include <complex.h>
10 .BI "double complex catan(double complex " z );
12 .BI "float complex catanf(float complex " z );
14 .BI "long double complex catanl(long double complex " z );
18 The catan() function calculates the complex atan().
19 If y = catan(z), then z = ctan(y).
20 The real part of y is chosen in the interval [-pi/2,pi/2].
23 catan(z) = 1/2i clog((1+iz)/(1-iz)).