File: for.xml

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<?xml version="1.0" encoding="ISO-8859-1"?>
<refentry version="5.0-subset Scilab" xml:id="for" xml:lang="en"
          xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:svg="http://www.w3.org/2000/svg"
          xmlns:ns5="http://www.w3.org/1999/xhtml"
          xmlns:mml="http://www.w3.org/1998/Math/MathML"
          xmlns:db="http://docbook.org/ns/docbook">
  <info>
    <pubdate>$LastChangedDate$</pubdate>
  </info>

  <refnamediv>
    <refname>for</refname>

    <refpurpose>palavra-chave de linguagem para laos ("loops") (significa
    "para...")</refpurpose>
  </refnamediv>

  <refsection>
    <title>Descrio</title>

    <para>Usado para definir laos ("loops"). sua sintaxe : <literal> for
    varivel=expresso ,instruo, ... ,instruo,end</literal></para>

    <para><literal> for varivel= expresso do instruo, ...
    ,instruo,end</literal></para>

    <para>Se <literal>expresso</literal>  uma matriz ou um vetor linha,
    <literal>varivel</literal> toma como valores os valores de cada coluna da
    matriz.</para>

    <para>Um caso particular utiliza o operador <link
    linkend="colon">colon</link> para criar vetores linhas regularmente
    espaados, e remonta a formas de lao "for" tradicionais : <literal>for
    variable=n1:step:n2, ...,end</literal></para>

    <para>Se <literal>expresso </literal> uma lista,
    <literal>varivel</literal> toma como valores as entradas sucessivas da
    lista.</para>

    <para>Aviso: o nmero de caracteres usados para definir o corpo de
    qualquer instruo condicional (if, while, for ou select/case) deve ser
    limitado a 16k.</para>
  </refsection>

  <refsection>
    <title>Exemplos</title>

    <programlisting role="example"><![CDATA[ 
// laos "for" tradicionais
n=5;
for i = 1:n, for j = 1:n, a(i,j) = 1/(i+j-1);end;end
for j = 2:n-1, a(j,j) = j; end; a
for j= 4:-1:1, disp(j),end // lao decrescente

//lao em colunas de matrizes
for  e=eye(3,3),e,end  
for v=a, write(6,v),end        
for j=1:n,v=a(:,j), write(6,v),end 

//lao em listas de entradas
for l=list(1,2,'example'); l,end 
 ]]></programlisting>
  </refsection>

  <refsection>
    <title>Ver Tambm</title>

    <simplelist type="inline">
      <member><link linkend="while">while</link></member>

      <member><link linkend="end">end</link></member>

      <member><link linkend="do">do</link></member>
    </simplelist>
  </refsection>
</refentry>