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.TH catan 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
.SH NAME
catan, catanf, catanl \- complex arc tangent functions
.SH SYNOPSIS
.LP
.nf
c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
#include <complex.h>

\fBdouble complex\fR \fBcatan\fR(\fBdouble complex\fR \fIz\fR);
.fi

.LP
.nf
\fBfloat complex\fR \fBcatanf\fR(\fBfloat complex\fR \fIz\fR);
.fi

.LP
.nf
\fBlong double complex\fR \fBcatanl\fR(\fBlong double complex\fR \fIz\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions compute the complex arc tangent of \fIz\fR, with branch cuts
outside the interval [ \(mi\fIi\fR, +++++\c
.if n pi\c
.if t \(*p
\c
\c
.if n pi\c
.if t \(*p
\c
\fIi\fR ] along the imaginary axis.
.SH RETURN VALUES
.sp
.LP
These functions return the complex arc tangent value, in the range of a strip
mathematically unbounded along the imaginary axis and in the interval [ \(mi\c
.if n pi\c
.if t \(*p
\c
/2, +\c
.if n pi\c
.if t \(*p
\c
/2 ] along the real axis.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityStandard
_
MT-LevelMT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBcomplex.h\fR(3HEAD), \fBctan\fR(3M), \fBattributes\fR(5), \fBstandards\fR(5)