CPROJ(3) Linux Programmer's Manual CPROJ(3)

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);

Link with -lm.

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.

These functions first appeared in glibc in version 2.1.

see_pthreads(7))">)">Multithreading (see pthreads(7))

The cproj(), cprojf(), and cprojl() functions are thread-safe.

C99.

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

cabs(3), complex(7)

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2013-09-18

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