cproj, cprojf, cprojl - project into Riemann Sphere
#include <complex.h>
double complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex z);
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.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| cproj (), cprojf (), cprojl () | Thread safety | MT-Safe |
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).