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 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
   Multithreading (see pthreads(7))
       The cproj(), cprojf(), and cprojl() functions are thread-safe.

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 3.74 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 http://www.kernel.org/doc/man-pages/.



                                            2013-09-18                                   CPROJ(3)