cproj(3) — Linux manual pages

Linux manual pages	Section 3

Name

cproj, cprojf, cprojl — project into Riemann Sphere

Synopsis

#include <complex.h>

double complex cproj( double complex z);

float complex cprojf( float complex z);

long double complex cprojl( long double complex z);

	Note
	Link with `−lm`.

DESCRIPTION

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.

VERSIONS

These functions first appeared in glibc in version 2.1.

CONFORMING TO

C99.

NOTES

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

COLOPHON

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