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<?xml version="1.0" encoding="ISO-8859-1"?>
<refentry version="5.0-subset Scilab" xml:id="poly" 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:ns3="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>poly</refname>
<refpurpose>definio de polinmios</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Seqncia de Chamamento</title>
<synopsis>p=poly(a,x, ["flag"])</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parmetros</title>
<variablelist>
<varlistentry>
<term>a</term>
<listitem>
<para>matriz ou nmero real </para>
</listitem>
</varlistentry>
<varlistentry>
<term>x</term>
<listitem>
<para>String, o nome da varivel simblica. Se o string tiver mais
de 4 caracteres, apenas os quatro primeiros sero levados em
conta.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>"flag"</term>
<listitem>
<para>string ("roots", "coeff"), valor padro "roots".</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Descrio</title>
<variablelist>
<varlistentry>
<term>Se a uma matriz,</term>
<listitem>
<para><literal>p</literal> o polinmio caracterstico, i.e.,
<literal>determinant(x*eye()-a)</literal>, <literal>x</literal>
sendo a varivel simblica.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Se v um vetor,</term>
<listitem>
<itemizedlist>
<listitem>
<para><literal>poly(v,"x",["roots"])</literal> o polinmio com
entradas de <literal>v</literal> como razes e
<literal>"x"</literal> como varivel formal (neste caso,
<literal>roots</literal> e <literal>poly</literal> so funes
inversas). Note que infinitas razes fornecem zero coeficientes
de grau mais elevado.</para>
</listitem>
<listitem>
<para><literal>poly(v,"x","coeff")</literal> cria o polinmio
com smbolo <literal>"x"</literal> e com entradas de
<literal>v</literal> como coeficientes (v(1) o termo constante
do polinmio). (aqui <literal>poly</literal> e
<literal>coeff</literal> so funes inversas).</para>
</listitem>
</itemizedlist>
</listitem>
</varlistentry>
</variablelist>
<para><literal>s=poly(0,"s")</literal> a fonte para definir polinmios
com smbolo <literal>"s"</literal>.</para>
</refsection>
<refsection>
<title>Exemplos</title>
<programlisting role="example"><![CDATA[
s=poly(0,"s");p=1+s+2*s^2;
A=rand(2,2);poly(A,"x")
//fraes racionais
h=(1+2*%s)/poly(1:4,'s','c')
]]></programlisting>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member><link linkend="coeff">coeff</link></member>
<member><link linkend="roots">roots</link></member>
<member><link linkend="varn">varn</link></member>
<member><link linkend="horner">horner</link></member>
<member><link linkend="derivat">derivat</link></member>
<member><link linkend="matrices">matrices</link></member>
<member><link linkend="rational">rational</link></member>
</simplelist>
</refsection>
</refentry>
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