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<?xml version="1.0" encoding="ISO-8859-1"?>
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* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
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* Copyright (C) 2008 - INRIA
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* This file must be used under the terms of the CeCILL.
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* This source file is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at
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* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
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<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" version="5.0-subset Scilab" xml:id="inv" xml:lang="en">
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<refname>inv</refname>
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<refpurpose>inversa de uma matriz</refpurpose>
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<title>Seq��ncia de Chamamento</title>
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<synopsis>inv(X)</synopsis>
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<title>Par�metros</title>
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<para>matriz quadrada de reais ou complexos, matriz de polin�mios,
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matriz de raz�es de polin�mios em representa��o de transfer�ncia ou
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<title>Descri��o</title>
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<literal>inv(X)</literal> � a inversa da matriz quadrada
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<literal>X</literal>. Uma aviso � impresso na tela se <literal>X</literal>
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possui m� escala ou � quase singular.
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<para>Para matrizes de polin�mios ou matrizes raz�es de polin�mios em
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representa��o de transfer�ncia, <literal>inv(X)</literal> � equivalente a
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<literal>invr(X)</literal>.
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<para>Para sistemas lineares na representa��o de espa�o de estados (lista
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<literal>syslin</literal>), <literal>invr(X)</literal> � equivalente a
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<literal>invsyslin(X)</literal>.
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<title>Refer�ncias</title>
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<para>A fun��o inv para matrizes de n�meros � baseada nas rotinas de
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Lapack DGETRF, DGETRI para matrizes de reais e ZGETRF, ZGETRI para o caso
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de matrizes de complexos. Para matrizes de polin�mios e matrizes de
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fun��es racionais, <literal>inv</literal> � baseado na fun��o
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<literal>invr</literal> do Scilab.
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<title>Exemplos</title>
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<programlisting role="example"><![CDATA[
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A=[x,1,x;x^2,2,1+x;1,2,3];inv(A)*A
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<refsection role="see also">
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<title>Ver Tamb�m</title>
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<simplelist type="inline">
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<link linkend="slash">slash</link>
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<link linkend="backslash">backslash</link>
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<link linkend="pinv">pinv</link>
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<link linkend="qr">qr</link>
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<link linkend="lufact">lufact</link>
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<link linkend="lusolve">lusolve</link>
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<link linkend="invr">invr</link>
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<link linkend="coff">coff</link>
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<link linkend="coffg">coffg</link>