File: pbig.xml

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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="pbig">
  <info>
    <pubdate>$LastChangedDate$</pubdate>
  </info>
  <refnamediv>
    <refname>pbig</refname>
    <refpurpose> projection sur des sous-espaces propres   </refpurpose>
  </refnamediv>
  <refsynopsisdiv>
    <title>Séquence d'appel</title>
    <synopsis>[Q,M]=pbig(A,thres,flag)</synopsis>
  </refsynopsisdiv>
  <refsection>
    <title>Paramètres</title>
    <variablelist>
      <varlistentry>
        <term>A  </term>
        <listitem>
          <para>matrice réelle carrée
	  </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>thres  </term>
        <listitem>
          <para>nombre réel
	  </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>flag  </term>
        <listitem>
          <para>chaîne de caractères (<literal>'c'</literal> ou <literal>'d'</literal>)
	  </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>Q,M  </term>
        <listitem>
          <para>matrices réelles
	  </para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsection>
  <refsection>
    <title>Description</title>
    <para>
      Projection sur des sous-espaces propres de A associés aux valeurs
      propres avec partie réelle &gt;= <literal>thres</literal>
      (<literal>flag='c'</literal>) ou avec module &gt;=
      <literal>thres</literal> (<literal>flag='d'</literal>).
    </para>
    <para>
      La projection est définie par <literal>Q*M</literal>, où <literal>Q</literal>
      est de rang maximal, les lignes de <literal>M</literal> sont
      linéairement indépendantes et <literal>M*Q=eye</literal>.
    </para>
    <para>
      Si <literal>flag='c'</literal>, les valeurs propres de
      <literal>M*A*Q</literal> = valeurs propres de <literal>A</literal> avec partie
      réelle &gt;= <literal>thres</literal>.
    </para>
    <para>
      Si <literal>flag='d'</literal>, les valeurs propres de
      <literal>M*A*Q</literal> = valeurs propres de <literal>A</literal> avec module
      &gt;= <literal>thres</literal>.
    </para>
    <para>
      Si <literal>flag='c'</literal> et si <literal>[Q1,M1]</literal> =
      factorisation de rang maximal (<literal>fullrf</literal>) de
      <literal>eye()-Q*M</literal> alors les valeurs propres de
      <literal>M1*A*Q1</literal> = valeurs propres de <literal>A</literal> avec
      partie réelle &lt; <literal>thres</literal>.
    </para>
    <para>
      Si <literal>flag='d'</literal> et si <literal>[Q1,M1]</literal> =
      factorisation de rang maximal (<literal>fullrf</literal>) de
      <literal>eye()-Q*M</literal> alors les valeurs propres de
      <literal>M1*A*Q1</literal> = valeurs propres de <literal>A</literal> avec
      module &lt; <literal>thres</literal>.
    </para>
  </refsection>
  <refsection>
    <title>Exemples</title>
    <programlisting role="example"><![CDATA[ 
A=diag([1,2,3]);X=rand(A);A=inv(X)*A*X;
[Q,M]=pbig(A,1.5,'d');
spec(M*A*Q)
[Q1,M1]=fullrf(eye()-Q*M);
spec(M1*A*Q1)
 ]]></programlisting>
  </refsection>
  <refsection>
    <title>Voir Aussi</title>
    <simplelist type="inline">
      <member>
        <link linkend="psmall">psmall</link>
      </member>
      <member>
        <link linkend="projspec">projspec</link>
      </member>
      <member>
        <link linkend="fullrf">fullrf</link>
      </member>
      <member>
        <link linkend="schur">schur</link>
      </member>
    </simplelist>
  </refsection>
  <refsection>
    <title>Auteurs</title>
    <para>F. Delebecque, INRIA (1988); ;   </para>
  </refsection>
  <refsection>
    <title>Fonctions Utilisées</title>
    <para><literal>pbig</literal> est basée sur la forme de Schur ordonnée
    (fonction Scilab <literal>schur</literal>).</para>
  </refsection>
</refentry>