1CATAN(3)                   Linux Programmer's Manual                  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  arc tangent of z.  If
19       y = catan(z), then z = ctan(y).  The real part of y is  chosen  in  the
20       interval [-pi/2,pi/2].
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22       One has:
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24           catan(z) = 1 / 2i clog((1 + iz) / (1 - iz))
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VERSIONS

27       These functions first appeared in glibc in version 2.1.
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CONFORMING TO

30       C99.
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SEE ALSO

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

36       This  page  is  part of release 3.25 of the Linux man-pages project.  A
37       description of the project, and information about reporting  bugs,  can
38       be found at http://www.kernel.org/doc/man-pages/.
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42                                  2008-08-11                          CATAN(3)
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