scilab/modules/graphics/help/pt_BR/2d_plot/contourf.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
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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,
  11  * and continues to be available under such terms.
  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: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="contourf" xml:lang="en">
  17     <refnamediv>
  18         <refname>contourf</refname>
  19         <refpurpose>Curvas de nível preenchidas de uma superfície em um esboço
  20             2d
  21         </refpurpose>
  22     </refnamediv>
  23     <refsynopsisdiv>
  24         <title>Seqüência de Chamamento</title>
  25         <synopsis>contourf(x,y,z,nz,[style,strf,leg,rect,nax])</synopsis>
  26     </refsynopsisdiv>
  27     <refsection role="parameters">
  28         <title>Parâmetrtos</title>
  29         <variablelist>
  30             <varlistentry>
  31                 <term>x,y</term>
  32                 <listitem>
  33                     <para>dois vetores de reais de tamanhos n1 e n2 definindo o grid.
  34                     </para>
  35                 </listitem>
  36             </varlistentry>
  37             <varlistentry>
  38                 <term>z</term>
  39                 <listitem>
  40                     <para>matriz de reais de tamanho (n1,n2), os valores da função.
  41                     </para>
  42                 </listitem>
  43             </varlistentry>
  44             <varlistentry>
  45                 <term>nz</term>
  46                 <listitem>
  47                     <para>os valores de nível ou o número de níveis.</para>
  48                     <variablelist>
  49                         <varlistentry>
  50                             <term>-</term>
  51                             <listitem>
  52                                 <para>
  53                                     Se <literal>nz</literal> for um inteiro, seu valor
  54                                     fornece o número de níveis igualmente espaçados de zmin a zmax
  55                                     como segue:
  56                                 </para>
  57                                 <programlisting role=""><![CDATA[
  58 z= zmin + (1:nz)*(zmax-zmin)/(nz+1)
  59  ]]></programlisting>
  60                                 <para>
  61                                     Note que os níveis <literal>zmin</literal> e
  62                                     <literal>zmax</literal> não são desenhados (genericamente eles
  63                                     são reduzidos a pontos) mas podem ser adicionados através de
  64                                 </para>
  65                                 <programlisting role=""><![CDATA[
  66 [im,jm] = find(z == zmin);     // ou zmax
  67 plot2d(x(im)',y(jm)',-9,"000")
  68  ]]></programlisting>
  69                             </listitem>
  70                         </varlistentry>
  71                         <varlistentry>
  72                             <term>-</term>
  73                             <listitem>
  74                                 <para>
  75                                     Se <literal>nz</literal> for um vetor,
  76                                     <literal>nz(i)</literal> fornece o valor da i-ésima curva de
  77                                     nível.
  78                                 </para>
  79                             </listitem>
  80                         </varlistentry>
  81                     </variablelist>
  82                 </listitem>
  83             </varlistentry>
  84             <varlistentry>
  85                 <term>style,strf,leg,rect,nax</term>
  86                 <listitem>
  87                     <para>
  88                         ver <literal>plot2d</literal>. O argumento
  89                         <literal>style</literal> fornece as cores a serem utilizadas pelas
  90                         curvas de nível. Deve ter o mesmo tamanho que o número de
  91                         níveis.
  92                     </para>
  93                 </listitem>
  94             </varlistentry>
  95         </variablelist>
  96     </refsection>
  97     <refsection role="description">
  98         <title>Descrição</title>
  99         <para>
 100             <literal>contourf</literal> pinta a superfície entre duas curvas de
 101             nível consecutivas <literal>z=f(x,y)</literal> em um esboço 2d. Os valores
 102             de <literal>f(x,y)</literal> são fornecidos pela matriz
 103             <literal>z</literal> nos pontos de grid definidos por <literal>x</literal>
 104             e <literal>y</literal>.
 105         </para>
 106         <para>Você pode mudar o formato dos pontos flutuantes impressos sobre os
 107             níveis utilizando <literal>xset("fpf",string)</literal> onde
 108             <literal>string</literal> fornece o formato em sintaxe de formato C ( por
 109             exemplo <literal>string="%.3f"</literal>). Use
 110             <literal>string=""</literal> para voltar ao formato padrão.
 111         </para>
 112         <para>
 113             Entre com o comando <literal>contourf()</literal> para visualizar
 114             uma demonstração.
 115         </para>
 116     </refsection>
 117     <refsection role="examples">
 118         <title>Exemplos</title>
 119         <programlisting role="example"><![CDATA[
 120 contourf(1:10,1:10,rand(10,10),5,1:5,"011"," ",[0,0,11,11])
 121
 122 function z=peaks(x,y)
 123 x1=x(:).*.ones(1,size(y,'*'));
 124 y1=y(:)'.*.ones(size(x,'*'),1);
 125 z =  (3*(1-x1).^2).*exp(-(x1.^2) - (y1+1).^2) ...
 126    - 10*(x1/5 - x1.^3 - y1.^5).*exp(-x1.^2-y1.^2) ...
 127    - 1/3*exp(-(x1+1).^2 - y1.^2)
 128 endfunction
 129
 130 function z=peakit()
 131 x=-4:0.1:4;y=x;z=peaks(x,y);
 132 endfunction
 133
 134 z=peakit();
 135
 136 levels=[-6:-1,-logspace(-5,0,10),logspace(-5,0,10),1:8];
 137 m=size(levels,'*');
 138 n = fix(3/8*m);
 139 r = [(1:n)'/n; ones(m-n,1)];
 140 g = [zeros(n,1); (1:n)'/n; ones(m-2*n,1)];
 141 b = [zeros(2*n,1); (1:m-2*n)'/(m-2*n)];
 142 h = [r g b];
 143 xset('colormap',h);
 144 xset('fpf',' ');
 145 clf();
 146 contourf([],[],z,[-6:-1,-logspace(-5,0,10),logspace(-5,0,10),1:8],0*ones(1,m))
 147
 148 xset('fpf','');
 149 clf();
 150 contourf([],[],z,[-6:-1,-logspace(-5,0,10),logspace(-5,0,10),1:8]);
 151  ]]></programlisting>
 152     </refsection>
 153     <refsection role="see also">
 154         <title>Ver Também</title>
 155         <simplelist type="inline">
 156             <member>
 157                 <link linkend="contour">contour</link>
 158             </member>
 159             <member>
 160                 <link linkend="fcontour">fcontour</link>
 161             </member>
 162             <member>
 163                 <link linkend="contour2di">contour2di</link>
 164             </member>
 165             <member>
 166                 <link linkend="plot2d">plot2d</link>
 167             </member>
 168             <member>
 169                 <link linkend="xset">xset</link>
 170             </member>
 171         </simplelist>
 172     </refsection>
 173 </refentry>