cproj(3)                                              Library Functions Manual                                             cproj(3)

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.

VERSIONS
       These functions were added in glibc 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 │
       └─────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS
       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)

Linux man-pages 6.03                                         2022-12-15                                                    cproj(3)