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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="quiver3" xml:lang="en">
<info>
<pubdate>$LastChangedDate: 26-05-2009 $</pubdate>
</info>
<refnamediv>
<refname>quiver3</refname>
<refpurpose>3D vector field plot on 3D surface</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>hdl = quiver3(X,Y,Z,U,V,W,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>Z</term>
<listitem>
<para>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>W</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>quiver3(X,Y,Z,U,V,W) plots vector field with cartesian coordinaes (U,V,W)
defined on a parametric or non parametric surface defined by (X,Y,Z) (see e.g.
surf for a discussion about the relative sizes of X,Y and Z). 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(-2:0.2:2,-1:0.2:1);
Z=cos(X.*Y);
surf(X,Y,Z);
hold on
[U,V,W] = surfnorm(X,Y,Z);
quiver3(X,Y,Z,U,V,W,'r');
legend 'Surface normals'
colormap gray
hold off
</programlisting>
</refsection>
<refsection>
<title>Screenshot</title>
<screenshot>
<mediaobject>
<imageobject>
<imagedata fileref="quiver3.png"/>
</imageobject>
</mediaobject>
</screenshot>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="quiver">quiver</link>
</member>
<member>
<link linkend="surf">surf</link>
</member>
</simplelist>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Stphane Mottelet</member>
</simplelist>
</refsection>
</refentry>
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