cprojl - project into Riemann Sphere

NAME  LIBRARY  SYNOPSIS  DESCRIPTION  ATTRIBUTES  STANDARDS  HISTORY  SEE ALSO 

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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).

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)

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