<?xml version="1.0" encoding="UTF-8"?>
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 * pursuant to article 5.3.4 of the CeCILL v.2.1.
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<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="ja" xml:id="des2ss">
    <refnamediv>
        <refname>des2ss</refname>
        <refpurpose>記述子から状態空間へ</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>呼び出し手順</title>
        <synopsis>[Sl]=des2ss(A,B,C,D,E [,tol])
            [Sl]=des2ss(Des)
        </synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>パラメータ</title>
        <variablelist>
            <varlistentry>
                <term>A,B,C,D,E</term>
                <listitem>
                    <para>適当な次元の実数行列</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>Des</term>
                <listitem>
                    <para>リスト</para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>Sl</term>
                <listitem>
                    <para>
                        <literal>syslin</literal> リスト
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>tol</term>
                <listitem>
                    <para>
                        実数パラメータ (閾値) (デフォルト値 <literal>100*%eps</literal>).
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>説明</title>
        <para>
            状態空間変換の記述子.
        </para>
        <para>
            <literal>Sl=des2ss(A,B,C,D,E)</literal> は,
            記述子システム <literal>(E,A,B,C,D)</literal>と等価な
            線形システム <literal>Sl</literal> を返します.
        </para>
        <para>
            添え字1個の<literal>(E,A)</literal>ペンシルの場合,
            明示式が使用され,
            より高次の添え字のペンシルの場合には<literal>rowshuff</literal>
            が使用されます.
        </para>
        <para>
            <literal>Sl=des2ss(Des)</literal> (ただし
            <literal>Des=list('des',A,B,C,D,E)</literal>) は,
            状態空間表現(多項式 <literal>D</literal> 行列が付く場合もある)の
            線形システム <literal>Sl</literal> を返します.
        </para>
        <para>
            一般化Leverrierアルゴリズムが使用されます.
        </para>
    </refsection>
    <refsection>
        <title>例</title>
        <programlisting role="example"><![CDATA[
s=poly(0,'s');G=[1/(s-1),s;1,2/s^3];
S1=tf2des(G);S2=tf2des(G,"withD");
W1=des2ss(S1);W2=des2ss(S2);
clean(ss2tf(W1))
clean(ss2tf(W2))
 ]]></programlisting>
    </refsection>
    <refsection role="see also">
        <title>参照</title>
        <simplelist type="inline">
            <member>
                <link linkend="des2tf">des2tf</link>
            </member>
            <member>
                <link linkend="glever">glever</link>
            </member>
            <member>
                <link linkend="rowshuff">rowshuff</link>
            </member>
        </simplelist>
    </refsection>
</refentry>
