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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2006-2008 - INRIA
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="denom">
<refnamediv>
<refname>denom</refname>
<refpurpose>denominator</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>den=denom(r)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>r</term>
<listitem>
<para>rational or polynomial or constant matrix.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>den</term>
<listitem>
<para>polynomial matrix</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
<literal>den=denom(r)</literal> returns the denominator of a rational matrix.
</para>
<para>
Since rationals are internally represented as
<literal>r=list(['r','num','den','dt'],num,den,[])</literal>,
<literal>denom(r</literal>) is the same as <literal>r(3)</literal>,
<literal>r('den')</literal> or <literal>r.den</literal>
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
h=(1+2*%s)/poly(1:4,'s','c');
denom(h)
numer(h)
s=poly(0,"s");
p=1+s+2*s^2;
denom(p) // Should return 1
numer(p)
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="numer">numer</link>
</member>
</simplelist>
</refsection>
</refentry>
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