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.

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)

Linux man-pages 6.7               2023-10-31                          cproj(3)