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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
* Ajouter ici d'ventuels commentaires sur le fichier XML
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns5="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" version="5.0-subset Scilab" xml:id="quiver" xml:lang="en">
<info>
<pubdate>$LastChangedDate: 26-05-2009 $</pubdate>
</info>
<refnamediv>
<refname>quiver</refname>
<refpurpose>2D vector field plot</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>hdl = quiver(X,Y,U,V,fact)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameter</title>
<variablelist>
<varlistentry>
<term>X</term>
<listitem>
<para>1 by n matrix or n by n matrix</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Y</term>
<listitem>
<para>1 by n matrix or n by n matrix</para>
</listitem>
</varlistentry>
<varlistentry>
<term>U</term>
<listitem>
<para>n by n matrix</para>
</listitem>
</varlistentry>
<varlistentry>
<term>V</term>
<listitem>
<para>n by n matrix</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fact</term>
<listitem>
<para>scalar</para>
</listitem>
</varlistentry>
<varlistentry>
<term>hdl</term>
<listitem>
<para>Handle of the created Fac3d entity</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>quiver(X,Y,U,V) plots vector field with cartesian coordinaes (U,V)
defined on a parametric or non parametric mesh defined by (X,Y) (see e.g.
surf for a discussion about the relative sizes of X and Y). The vectors
are automatically scaled to fit in the grid defined by X and Y.</para>
<para>The last argument 'fact' is a scale factor for the vectors, if you
want to change the length of vectors. If you don't want any scaling at
all, use fact=0.</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example">[X,Y]=meshgrid(linspace(-1,1,20),linspace(-1,1,20));
quiver(X,Y,-X,Y,'og');
legend('(-x,y) field');
</programlisting>
</refsection>
<refsection>
<title>Screenshot</title>
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="quiver.png"/>
</imageobject>
</mediaobject>
</screenshot>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="quiver3">quiver3</link>
</member>
</simplelist>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Stphane Mottelet</member>
</simplelist>
</refsection>
</refentry>
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