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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sat Jul 24 21:41:06 1993 by Rik Faith (faith@cs.unc.edu)
.\"
.\" Translated into german by Markus Schmitt (fw@math.uni-sb.de)
.\"
.TH ATAN2 3 "1. Juli 1996" "" "Bibliotheksfunktionen"
.\"
.SH BEZEICHNUNG
atan2 - die Arkus-Tangens Funktion zweier Vernderlicher
.SH "BERSICHT"
.nf
.B #include <math.h>
.sp
.BI "double atan2(double " y ", double " x );
.fi
.SH BESCHREIBUNG
Die Funktion
.B atan2()
berechnet den Arkus-Tangens der beiden Variablen
.I x , y.
Das ist gleichbedeutend mit dem Armus-Tangens von
.I y / x,
wobei das Vorzeichen beider Argumente dazu benutzt wird, den
Quadranten zu bestimmen.
.SH "RCKGABEWERT"
Die Funktion gibt den Radialwert zurck, der zwischen -Pi und Pi
liegt.
.SH "KONFORM ZU"
SVID 3, POSIX, BSD 4.3, ISO 9899
.SH "SIEHE AUCH"
.BR acos (3),
.BR asin (3),
.BR atan (3),
.BR cos (3),
.BR sin (3),
.BR tan (3).
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