60 lines
1.9 KiB
Groff
60 lines
1.9 KiB
Groff
|
.\" $NetBSD: cproj.3,v 1.2 2010/09/15 18:40:27 wiz Exp $
|
||
|
|
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
||
|
|
.TH "CPROJ" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
||
|
|
.\" cproj
|
||
|
|
.SH NAME
|
||
|
|
cproj, cprojf, cprojl \- complex projection functions
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.LP
|
||
|
|
\fB#include <complex.h>
|
||
|
|
.br
|
||
|
|
.sp
|
||
|
|
double cproj(double complex\fP \fIz\fP\fB);
|
||
|
|
.br
|
||
|
|
float cprojf(float complex\fP \fIz\fP\fB);
|
||
|
|
.br
|
||
|
|
long double cprojl(long double complex\fP \fIz\fP\fB);
|
||
|
|
.br
|
||
|
|
\fP
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.LP
|
||
|
|
These functions compute a projection of \fIz\fP ono the Riemann sphere:
|
||
|
|
\fIz\fP projects to \fIz\fP , except that all complex infinities (even those
|
||
|
|
with one infinite part and one NaN part) project to positive infinity on the
|
||
|
|
real axis. If \fIz\fP has an infinite part, then cproj(z) shall be equivalent to:
|
||
|
|
INFINITY + I * copysign(0.0, cimag(z))
|
||
|
|
.SH RETURN VALUE
|
||
|
|
.LP
|
||
|
|
These functions return the value of the projection onto the Riemann sphere.
|
||
|
|
.SH ERRORS
|
||
|
|
.LP
|
||
|
|
No errors are defined.
|
||
|
|
.LP
|
||
|
|
\fIThe following sections are informative.\fP
|
||
|
|
.SH EXAMPLES
|
||
|
|
.LP
|
||
|
|
None.
|
||
|
|
.SH APPLICATION USAGE
|
||
|
|
.LP
|
||
|
|
None.
|
||
|
|
.SH RATIONALE
|
||
|
|
.LP
|
||
|
|
None.
|
||
|
|
.SH FUTURE DIRECTIONS
|
||
|
|
.LP
|
||
|
|
None.
|
||
|
|
.SH SEE ALSO
|
||
|
|
.LP
|
||
|
|
\fIcarg\fP(), \fIcimag\fP(), \fIconj\fP(), \fIcreal\fP() the
|
||
|
|
Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<complex.h>\fP
|
||
|
|
.SH 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 .
|