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() shall be equivalent to:

INFINITY + I * copysign(0.0, cimag(z))

RETURN VALUES

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

ERRORS

No errors are defined.

SEE ALSO

carg(3), cimag(3), conj(3), creal(3), IEEE Std 1003.1-2001 (“POSIX.1”) <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 .