1CATAN(3)                     complex math routines                    CATAN(3)
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NAME

6       catan, catanf, catanl - complex arc tangents
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SYNOPSIS

9       #include <complex.h>
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11       double complex catan(double complex z);
12       float complex catanf(float complex z);
13       long double complex catanl(long double complex z);
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15       Link with -lm.
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DESCRIPTION

18       The  catan()  function calculates the complex atan().  If y = catan(z),
19       then z = ctan(y).  The real  part  of  y  is  chosen  in  the  interval
20       [-pi/2,pi/2].
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22       One has catan(z) = 1/2i clog((1+iz)/(1-iz)).
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CONFORMING TO

25       C99
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SEE ALSO

28       ccos(3), clog(3), complex(7)
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32                                  2002-07-28                          CATAN(3)