bionic (3) cproj.3.gz

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

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       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)