netbsd man page for cproj

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 equiv-
       alent 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 ALSO
       carg(), 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 Technol-
       ogy -- 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)