cproj

cproj, cprojf, cprojl - project into Riemann Sphere

#include <complex.h> I double complex cproj(double complex z );
I float complex cprojf(float complex z );
I long double complex cprojl(long double complex z ); Link with -lm.

This function projects 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.

C99

The glibc implementation is broken and does something entirely different.

cabs(3), complex(7)