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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:ns3="http://www.w3.org/1999/xhtml"
          xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook"
          xmlns:scilab="http://www.scilab.org" xml:id="arma2ss" xml:lang="en">
    <refnamediv>
        <refname>arma2ss</refname>
        <refpurpose>transform an armax data structure into state space
            representation.
        </refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Syntax</title>
        <synopsis>
            [S, Sn] = arma2ss(Ar)
            S = arma2ss(Ar)
        </synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Parameters</title>
        <variablelist>
            <varlistentry>
                <term>Ar</term>
                <listitem>
                    <para>
                        an armax data structure (see <link linkend="armac">armac</link>.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>S</term>
                <listitem>
                    <para>
                        a discrete time state space data structure (see <link linkend="syslin">syslin</link>. The regular input to output
                        transfer.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>Sn</term>
                <listitem>
                    <para>
                        a discrete time state space data structure (see <link linkend="syslin">syslin</link>. The noise input to output
                        transfer.
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Description</title>
        <para>
            <literal>[S,Sn] = arma2ss(Ar) </literal>transform an armax data
            structure into a state space representation. The full armax transfer
            <literal>F</literal>can be obtained by <literal>F=[S,Sn]</literal>.
        </para>
    </refsection>
    <refsection>
        <title>Examples</title>
        <programlisting role="example">A = [eye(2,2),[-1.5 0.1;-0.2 1.5],[0.7 -0.3;0.1 0.7]];
            B = [[0;0] [1;-1] [0.5;1.2]];
            Ar = armac(A, B, zeros(2, 2), 2, 1, 0)
            [S, Sn] = arma2ss(Ar)
        </programlisting>
    </refsection>
    <refsection role="see also">
        <title>See also</title>
        <simplelist type="inline">
            <member>
                <link linkend="armac">armac</link>
            </member>
            <member>
                <link linkend="arma">arma</link>
            </member>
            <member>
                <link linkend="syslin">syslin</link>
            </member>
        </simplelist>
    </refsection>
    <refsection>
        <title>History</title>
        <revhistory>
            <revision>
                <revnumber>5.4.0</revnumber>
                <revremark>arma2ss added.</revremark>
            </revision>
        </revhistory>
    </refsection>
</refentry>
