NAME

cproj, cprojf, cprojl - complex projection functions

SYNOPSIS

c99 [ flag... ] file... -lm [ library... ]
#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 compute a projection of z onto the Riemann sphere: z projects to z, except that all complex infinities (even those with one infinite part and one NaN part) project to positive infinity on the real axis. If z has an infinite part, then cproj(z) is equivalent to:

INFINITY + I * copysign(0.0, cimag(z))

RETURN VALUES

These functions return the value of the projection onto the Riemann sphere.

ERRORS

No errors are defined.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard
MT-Level	MT-Safe