cproj
, cprojf
— Riemann sphere projection#include <complex.h> double complex cproj(double complex z); float complex cprojf(float 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))
cprojf
is identical to cproj
, except that it performs
its calculations on floats complex
.
Returns
The cproj functions return the value of the projection onto
the Riemann sphere.
Portability
cproj
and cprojf
are ISO C99