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NAME

       cproj, cprojf, cprojl - project into Riemann Sphere

SYNOPSIS

       #include <complex.h>

       double complex cproj(double complex z);
       float complex cprojf(float complex z);
       long double complex cprojl(long double complex z);

       Link with -lm.

DESCRIPTION

       This  function  projects  a  point  in  the plane onto the surface of a
       Riemann Sphere, the one-point compactification of  the  complex  plane.
       Each finite point z projects to z itself.  Every complex infinite value
       is projected to a single infinite value, namely to positive infinity on
       the real axis.

VERSIONS

       These functions first appeared in glibc in version 2.1.

CONFORMING TO

       C99.

NOTES

       In  glibc 2.11 and earlier, the implementation does something different
       (a stereographic projection onto a Riemann Sphere).

SEE ALSO

       cabs(3), complex(7)

COLOPHON

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                                  2010-06-10                          CPROJ(3)