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<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>empty</refname>
<refpurpose>([]) matriz vazia</refpurpose>
</refnamediv>
<refsection>
<title>Descrio</title>
<para><literal> [] </literal> denota a matriz vazia. definida de modo
nico e possui 0 linha e 0 coluna, i.e. <literal> size([]) =[0,0]
</literal>. As seguintes convenes convenientes foram feitas:</para>
<para><literal> [] * A = A * [] = [] </literal></para>
<para><literal> [] + A = A + [] = A</literal></para>
<para>[ [], A] = [A, []] = A <literal> inv([]) =[] </literal></para>
<para><literal> det([])=cond([])=rcond([])=1, rank([])=0</literal></para>
<para>Funes de matrizes retornam <literal>[]</literal> ou produzem uma
mensagem de erro quando no h resposta bvia. Sistemas lineares vazios
(listas<literal> syslin</literal>) podem ter vrias linhas ou
colunas.</para>
</refsection>
<refsection>
<title>Exemplos</title>
<programlisting role="example"><![CDATA[
s=poly(0,'s'); A = [s, s+1];
A+[], A*[]
A=rand(2,2); AA=A([],1), size(AA)
svd([])
w=ssrand(2,2,2); wr=[]*w; size(wr), w1=ss2tf(wr), size(w1)
]]></programlisting>
</refsection>
<refsection>
<title>Ver Tambm</title>
<simplelist type="inline">
<member><link linkend="matrices">matrices</link></member>
<member><link linkend="poly">poly</link></member>
<member><link linkend="string">string</link></member>
<member><link linkend="boolean">boolean</link></member>
<member><link linkend="rational">rational</link></member>
<member><link linkend="syslin">syslin</link></member>
</simplelist>
</refsection>
</refentry>
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