cproj
, cprojf
,
cprojl
—
complex projection functions
#include <complex.h>
double
cproj
(double
complex z);
float
cprojf
(float
complex z);
long double
cprojl
(long
double complex z);
#include
<tgmath.h>
complex-floating
cproj
(complex-floating
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
() shall be equivalent to:
INFINITY + I * copysign(0.0, cimag(z))
These functions return the value of the projection onto the Riemann sphere.
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html .