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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
       These functions project a point in the plane onto the surface of a Rie-
       mann 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 4.10 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)