CPROJ(3)                                            Linux Programmer's Manual                                           CPROJ(3)



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 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



                                                           2010-06-10                                                   CPROJ(3)