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 3.53 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)