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 $
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "CPROJ" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" cproj
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.SH NAME
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cproj, cprojf, cprojl \- complex projection functions
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.SH SYNOPSIS
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.LP
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\fB#include <complex.h>
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.br
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.sp
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double cproj(double complex\fP \fIz\fP\fB);
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.br
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float cprojf(float complex\fP \fIz\fP\fB);
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.br
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long double cprojl(long double complex\fP \fIz\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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These functions compute a projection of \fIz\fP ono the Riemann sphere:
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\fIz\fP projects to \fIz\fP , except that all complex infinities (even those
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with one infinite part and one NaN part) project to positive infinity on the
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real axis. If \fIz\fP has an infinite part, then cproj(z) shall be equivalent to:
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INFINITY + I * copysign(0.0, cimag(z))
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.SH RETURN VALUE
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.LP
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These functions return the value of the projection onto the Riemann sphere.
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.SH ERRORS
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.LP
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No errors are defined.
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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None.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIcarg\fP(), \fIcimag\fP(), \fIconj\fP(), \fIcreal\fP() the
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Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<complex.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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