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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

       This  page  is  part of release 3.35 of the Linux man-pages project.  A description of the
       project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
       pages/.

                                            2010-06-10                                   CPROJ(3)