scilab/modules/differential_equations/help/pt_BR/intsplin.xml

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
   2 <refentry 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" xmlns:scilab="http://www.scilab.org" xml:id="intsplin" xml:lang="pt">
   3     <refnamediv>
   4         <refname>intsplin</refname>
   5         <refpurpose>integração de dados experimentais por interpolação por
   6             spline
   7         </refpurpose>
   8     </refnamediv>
   9     <refsynopsisdiv>
  10         <title>Seqüência de Chamamento</title>
  11         <synopsis>
  12           v = intsplin(y)
  13           v = intsplin(x, y)
  14         </synopsis>
  15     </refsynopsisdiv>
  16     <refsection>
  17         <title>Parâmetros</title>
  18         <variablelist>
  19             <varlistentry>
  20                 <term>x</term>
  21                 <listitem>
  22                     <para>
  23                         vetor de dados de coordenadas <literal>x</literal> crescentes.
  24                         O valor padrão é
  25                         <literal>1:size(y,'*')</literal>
  26                     </para>
  27                 </listitem>
  28             </varlistentry>
  29             <varlistentry>
  30                 <term>y</term>
  31                 <listitem>
  32                     <para>
  33                         vetor de dados de coordenadas <literal>y</literal>
  34                     </para>
  35                 </listitem>
  36             </varlistentry>
  37             <varlistentry>
  38                 <term>v</term>
  39                 <listitem>
  40                     <para>valor da integral</para>
  41                 </listitem>
  42             </varlistentry>
  43         </variablelist>
  44     </refsection>
  45     <refsection>
  46         <title>Descrição</title>
  47         <para>Computa :</para>
  48         <para>
  49             Onde <literal>f</literal> é uma função descrita por um conjunto de valores
  50             experimentais:
  51         </para>
  52         <para>
  53             <literal>y(i)=f(x(i))</literal> e <literal>x0=x(1)</literal>,
  54             <literal>x1=x(n)</literal>
  55         </para>
  56         <para>Entre os pontos da malha a função é interpolada usando-se
  57             splines.
  58         </para>
  59     </refsection>
  60     <refsection>
  61         <title>Exemplos</title>
  62         <programlisting role="example"><![CDATA[
  63 t = 0:0.1:%pi
  64 intsplin(t,sin(t))
  65
  66 intsplin(1:5)            // 12
  67
  68 x = 0:0.1:0.4;
  69 intsplin(x, 1:5)         // 1.2
  70
  71 intsplin((1:5)*%i)       // 12i
  72 intsplin(x, (1:5)*%i)    // 1.2i
  73 intsplin(x, x+(1:5)*%i)  // 0.08 + 1.2i
  74  ]]></programlisting>
  75     </refsection>
  76     <refsection role="see also">
  77         <title>Ver Também</title>
  78         <simplelist type="inline">
  79             <member>
  80                 <link linkend="intg">intg</link>
  81             </member>
  82             <member>
  83                 <link linkend="integrate">integrate</link>
  84             </member>
  85             <member>
  86                 <link linkend="inttrap">inttrap</link>
  87             </member>
  88             <member>
  89                 <link linkend="splin">splin</link>
  90             </member>
  91         </simplelist>
  92     </refsection>
  93 </refentry>