CPROJ(3P) POSIX Programmer's Manual CPROJ(3P)NAME
cproj, cprojf, cprojl - complex projection functions
SYNOPSIS
#include <complex.h>
double cproj(double complex z);
float cprojf(float complex z);
long double 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) shall be equivalent
to: INFINITY + I * copysign(0.0, cimag(z))
RETURN VALUE
These functions return the value of the projection onto the Riemann
sphere.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOcarg(), cimag(), conj(), creal() the Base Definitions volume of
IEEE Std 1003.1-2001, <complex.h>
COPYRIGHT
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 .
IEEE/The Open Group 2003 CPROJ(3P)
