.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
.TH "CATAN" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\" catan 
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
.SH NAME
catan, catanf, catanl \- complex arc tangent functions
.SH SYNOPSIS
.LP
\fB#include <complex.h>
.br
.sp
double complex catan(double complex\fP \fIz\fP\fB);
.br
float complex catanf(float complex\fP \fIz\fP\fB);
.br
long double complex catanl(long double complex\fP \fIz\fP\fB);
.br
\fP
.SH DESCRIPTION
.LP
These functions shall compute the complex arc tangent of \fIz\fP,
with branch cuts outside the interval
[-\fIi\fP,\ +\fIi\fP] along the imaginary axis.
.SH RETURN VALUE
.LP
These functions shall return the complex arc tangent value, in the
range of a strip mathematically unbounded along the imaginary
axis and in the interval [-pi/2,\ +pi/2] along the
real axis.
.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
\fIctan\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 .