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[scilab.git] / scilab / modules / cacsd / help / pt_BR / plot_display / zgrid.xml
1 <?xml version="1.0" encoding="ISO-8859-1"?>
2 <!--
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4  * Copyright (C) INRIA
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9  * pursuant to article 5.3.4 of the CeCILL v.2.1.
10  * This file was originally licensed under the terms of the CeCILL v2.1,
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12  * For more information, see the COPYING file which you should have received
13  * along with this program.
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16 <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="en">
17     <refnamediv>
18         <refname>zgrid</refname>
19         <refpurpose>esboçode um z-grid</refpurpose>
20     </refnamediv>
21     <refsynopsisdiv>
22         <title>Seqüência de Chamamento</title>
23         <synopsis>zgrid()</synopsis>
24     </refsynopsisdiv>
25     <refsection>
26         <title>Descrição</title>
27         <para>Esboça as linhas de grid de um Z-plano: linhas de fator constante de
28             amortecimento (zeta) e freqüência natural (Wn) são esboçadas dentro do
29             círculo unitário do Z-plano.
30         </para>
31         <para>Curvas de iso-freqüência são exibidas em freqüência*passo no
32             intervalo [0,0.5]. O limite superior corresponde à freqüência de Shannon
33             <literal>( 1/dt &gt; 2*f )</literal>.
34         </para>
35     </refsection>
36     <refsection>
37         <title>Examplos</title>
38         <programlisting role="example"><![CDATA[
39     //zgrid
40     clf();zgrid(0:0.2:1,[0.2 0.6 0.8 1])
41     ]]></programlisting>
42         <para>
43             <scilab:image>
44                 zgrid(0:0.2:1,[0.2 0.6 0.8 1])
45             </scilab:image>
46         </para>
47         <programlisting role="example"><![CDATA[
48     //zgrid with discrete time system  root locus
49     z=poly(0,'z')
50     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))
51     clf();evans(H,1000);zgrid(0:0.1:0.5)
52
53     ]]></programlisting>
54         <para>
55             <scilab:image localized="true">
56                 z=poly(0,'z')
57                 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))
58                 clf();evans(H,1000);zgrid(0:0.1:0.5)
59             </scilab:image>
60         </para>
61         
62     </refsection>
63     
64     <refsection role="see also">
65         <title>Ver Também</title>
66         <simplelist type="inline">
67             <member>
68                 <link linkend="frep2tf">frep2tf</link>
69             </member>
70             <member>
71                 <link linkend="freson">freson</link>
72             </member>
73         </simplelist>
74     </refsection>
75 </refentry>