noble (3) cproj.3.gz

NAME

       cproj, cprojf, cprojl - project into Riemann Sphere

LIBRARY

       Math library (libm, -lm)

SYNOPSIS

       #include <complex.h>

       double complex cproj(double complex z);
       float complex cprojf(float complex z);
       long double complex cprojl(long double complex z);

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.

ATTRIBUTES

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

       ┌──────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                     │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │cproj(), cprojf(), cprojl()                                                   │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       glibc 2.1.  C99, POSIX.1-2001.

       In glibc 2.11 and earlier, the implementation does something different (a stereographic projection onto a
       Riemann Sphere).

SEE ALSO

       cabs(3), complex(7)