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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2008 - INRIA
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
-->
<refentry version="5.0-subset Scilab" xml:id="unique" 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:ns5="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>unique</refname>
<refpurpose>extract unique components of a vector or matrices</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[N [,k]]=unique(M)
[N [,k]]=unique(M ,orient)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term>M</term>
<listitem>
<para>vector or matrix of numbers or strings</para>
</listitem>
</varlistentry>
<varlistentry>
<term>orient</term>
<listitem>
<para>flag with possible values : 1 or "r", 2 or "c"</para>
</listitem>
</varlistentry>
<varlistentry>
<term>N</term>
<listitem>
<para>vector or matrix of numbers or strings</para>
</listitem>
</varlistentry>
<varlistentry>
<term>k</term>
<listitem>
<para>vector of integers</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para><literal>unique(M)</literal> returns a vector which retains the
unique entries of <literal>M</literal> in ascending order.</para>
<para><literal>unique(M,"r")</literal> or
<literal>unique(M,1)</literal>returns the unique rows of
<literal>M</literal> in lexicographic ascending order.</para>
<para><literal>unique(M,"c")</literal> or
<literal>unique(M,2)</literal>returns the unique columns of
<literal>M</literal> in lexicographic ascending order.</para>
<para>If required the output argument <literal>k</literal> contains the
position of the first encountered unique entries.</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
M=round(2*rand(20,1));
unique(M)
[N,k]=unique(M)
unique(string(M))
[N,k]=unique(string(M))
A = [0,0,1,1;
0,1,1,1;
2,0,1,1;
0,2,2,2;
2,0,1,1;
0,0,1,1];
T='x'+string(A);
//unique rows
[m,k]=unique(A,'r')
unique(T,'r')
//unique columns
[m,k]=unique(T,'c')
unique(A,'c')
]]></programlisting>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member><link linkend="union">union</link></member>
<member><link linkend="intersect">intersect</link></member>
<member><link linkend="gsort">gsort</link></member>
<member><link linkend="lex_sort">lex_sort</link></member>
</simplelist>
</refsection>
</refentry>
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