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

   These  functions  project  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.

ATTRIBUTES

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface                    Attribute      Value   
   
   cproj(), cprojf(), cprojl()  Thread safety  MT-Safe 
   

CONFORMING TO

   C99, POSIX.1-2001, POSIX.1-2008.

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 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at
   https://www.kernel.org/doc/man-pages/.

                              2015-04-19                          CPROJ(3)

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