CPROJ(3M) Mathematical Library Functions CPROJ(3M)

cproj, cprojf, cprojl - complex projection functions

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);

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))

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

No errors are defined.

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

Interface Stability Standard
MT-Level MT-Safe

complex.h(3HEAD), carg(3M), cimag(3M), conj(3M), creal(3M), attributes(7), standards(7)

July 12, 2006 SunOS 5.11