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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 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-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" version="5.0-subset Scilab" xml:lang="fr" xml:id="coff">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>coff</refname>
<refpurpose> résolvante (méthode des cofacteurs) </refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Séquence d'appel</title>
<synopsis>[N,d]=coff(M [,var])</synopsis>
</refsynopsisdiv>
<refsection>
<title>Paramètres</title>
<variablelist>
<varlistentry>
<term>M </term>
<listitem>
<para>matrice carrée réelle
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>var </term>
<listitem>
<para>chaîne de caractères (indéterminée des polynômes)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>N </term>
<listitem>
<para>matrice de polynômes (de même taille que <literal>M</literal>)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>d </term>
<listitem>
<para>polynôme (polynôme caractéristique de M : <literal>poly(M,var)</literal>)
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para><literal>coff</literal> calcule R=<literal>(s*eye()-M)^-1</literal> pour <literal>M</literal> une matrice réelle.
R est donnée par <literal>N/d</literal>.
</para>
<para><literal>N</literal> = matrice des numérateurs (polynômes).
</para>
<para><literal>d</literal> = dénominateur commun.
</para>
<para><literal>var</literal> chaîne de caractères (indéterminée des polynômes, '<literal>s</literal>' par défaut)
</para>
</refsection>
<refsection>
<title>Exemples</title>
<programlisting role="example"><![CDATA[
M=[1,2;0,3];
[N,d]=coff(M)
N/d
inv(%s*eye()-M)
]]></programlisting>
</refsection>
<refsection>
<title>Voir Aussi</title>
<simplelist type="inline">
<member>
<link linkend="coffg">coffg</link>
</member>
<member>
<link linkend="ss2tf">ss2tf</link>
</member>
<member>
<link linkend="nlev">nlev</link>
</member>
<member>
<link linkend="poly">poly</link>
</member>
</simplelist>
</refsection>
</refentry>
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