<?xml version="1.0" encoding="UTF-8"?>
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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:ns4="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="zgrid" xml:lang="pt">
    <refnamediv>
        <refname>zgrid</refname>
        <refpurpose>esboçode um z-grid</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Seqüência de Chamamento</title>
        <synopsis>zgrid()</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Descrição</title>
        <para>Esboça as linhas de grid de um Z-plano: linhas de fator constante de
            amortecimento (zeta) e freqüência natural (Wn) são esboçadas dentro do
            círculo unitário do Z-plano.
        </para>
        <para>Curvas de iso-freqüência são exibidas em freqüência*passo no
            intervalo [0,0.5]. O limite superior corresponde à freqüência de Shannon
            <literal>( 1/dt &gt; 2*f )</literal>.
        </para>
    </refsection>
    <refsection>
        <title>Examplos</title>
        <programlisting role="example"><![CDATA[
    //zgrid
    clf();zgrid(0:0.2:1,[0.2 0.6 0.8 1])
    ]]></programlisting>
        <para>
            <scilab:image>
                zgrid(0:0.2:1,[0.2 0.6 0.8 1])
            </scilab:image>
        </para>
        <programlisting role="example"><![CDATA[
    //zgrid with discrete time system  root locus
    z=poly(0,'z')
    H=syslin(0.01,(0.54-1.8*z+2.9*z^2-2.6*z^3+z^4)/(0.8+0.78*z-0.1*z^2+0.9*z^3+z^4))
    clf();evans(H,1000);zgrid(0:0.1:0.5)

    ]]></programlisting>
        <para>
            <scilab:image localized="true">
                z=poly(0,'z')
                H=syslin(0.01,(0.54-1.8*z+2.9*z^2-2.6*z^3+z^4)/(0.8+0.78*z-0.1*z^2+0.9*z^3+z^4))
                clf();evans(H,1000);zgrid(0:0.1:0.5)
            </scilab:image>
        </para>

    </refsection>

    <refsection role="see also">
        <title>Ver Também</title>
        <simplelist type="inline">
            <member>
                <link linkend="frep2tf">frep2tf</link>
            </member>
            <member>
                <link linkend="freson">freson</link>
            </member>
        </simplelist>
    </refsection>
</refentry>
