<?xml version="1.0" encoding="UTF-8"?>
<!--
 * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 * Copyright (C) 2008 - INRIA
 *
 * Copyright (C) 2012 - 2016 - Scilab Enterprises
 *
 * This file is hereby licensed under the terms of the GNU GPL v2.0,
 * pursuant to article 5.3.4 of the CeCILL v.2.1.
 * This file was originally licensed under the terms of the CeCILL v2.1,
 * and continues to be available under such terms.
 * For more information, see the COPYING file which you should have received
 * along with this program.
 *
 -->
<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="acosm" xml:lang="pt">
    <refnamediv>
        <refname>acosm</refname>
        <refpurpose>arco-coseno da matriz (matriz arco-cosseno)</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Seqüência de Chamamento</title>
        <synopsis>t=acosm(x)</synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Parâmetros</title>
        <variablelist>
            <varlistentry>
                <term>x</term>
                <listitem>
                    <para>matriz quadrada de reais ou complexos </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>t</term>
                <listitem>
                    <para>matriz quadrada de reais ou complexos</para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Descrição</title>
        <para>
            <literal>t</literal> é o arco-cosseno da matriz <literal>x</literal>
            (matriz arco-cosseno de x). É usado o método da diagonalização. Para
            matrizes não-simétricas, o resultado pode ser impreciso. Tem-se
            <literal>t=-%i*logm(x+%i*sqrtm(eye()-x*x))</literal>
        </para>
    </refsection>
    <refsection>
        <title>Exemplos</title>
        <programlisting role="example"><![CDATA[
A=[1,2;3,4];
cosm(acosm(A))
 ]]></programlisting>
    </refsection>
    <refsection>
        <title>Ver Também </title>
        <simplelist type="inline">
            <member>
                <link linkend="acos">acos</link>
            </member>
            <member>
                <link linkend="sqrtm">sqrtm</link>
            </member>
            <member>
                <link linkend="logm">logm</link>
            </member>
        </simplelist>
    </refsection>
</refentry>
