File: det.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="det">
  <info>
    <pubdate>$LastChangedDate$</pubdate>
  </info>
  <refnamediv>
    <refname>det </refname>
    <refpurpose> déterminant  </refpurpose>
  </refnamediv>
  <refsynopsisdiv>
    <title>Séquence d'appel</title>
    <synopsis>det(X)
[e,m]=det(X)</synopsis>
  </refsynopsisdiv>
  <refsection>
    <title>Paramètres</title>
    <variablelist>
      <varlistentry>
        <term>X  </term>
        <listitem>
          <para>matrice réelle, complexe, polynomiale, rationnelle
	  </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>m  </term>
        <listitem>
          <para>nombre réel ou complexe, mantisse du déterminant en base 10
	  </para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term>e  </term>
        <listitem>
          <para>entier, exposant du déterminant en base 10 
	  </para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsection>
  <refsection>
    <title>Description</title>
    <para><literal>det(X)</literal> ( <literal>m*10^e</literal> est le déterminant de la matrice carrée <literal>X</literal>.
    </para>
    <para>
      Pour les matrices polynomiales <literal>det(X)</literal> est équivalent à <literal>determ(X)</literal>.
    </para>
    <para>
      Pour les matrices rationnelles <literal>det(X)</literal> est équivalent à <literal>detr(X)</literal>.
    </para>
  </refsection>
  <refsection>
    <title>Exemples</title>
    <programlisting role="example"><![CDATA[ 
x=poly(0,'x');
det([x,1+x;2-x,x^2])
w=ssrand(2,2,4);roots(det(systmat(w))),trzeros(w)   // zéros du système linéaire
A=rand(3,3);
det(A), prod(spec(A))
 ]]></programlisting>
  </refsection>
  <refsection>
    <title>Voir Aussi</title>
    <simplelist type="inline">
      <member>
        <link linkend="detr">detr</link>
      </member>
      <member>
        <link linkend="determ">determ</link>
      </member>
    </simplelist>
  </refsection>
  <refsection>
    <title>Fonctions Utilisées</title>
    <para>
      Le calcul du determinant est basé sur les routines Lapack :
      DGETRF pour les matrices réelles et  ZGETRF pour le cas complexe.
    </para>
  </refsection>
</refentry>