<html lang="en">
<head>
<title>Sets - Untitled</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Untitled">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="prev" href="Statistics.html#Statistics" title="Statistics">
<link rel="next" href="Polynomial-Manipulations.html#Polynomial-Manipulations" title="Polynomial Manipulations">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family:serif; font-weight:normal; }
span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<div class="node">
<a name="Sets"></a>
<p>
Next: <a rel="next" accesskey="n" href="Polynomial-Manipulations.html#Polynomial-Manipulations">Polynomial Manipulations</a>,
Previous: <a rel="previous" accesskey="p" href="Statistics.html#Statistics">Statistics</a>,
Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
<hr>
</div>
<h2 class="chapter">26 Sets</h2>
<p>Octave has a limited number of functions for managing sets of data, where a
set is defined as a collection of unique elements. In Octave a set is
represented as a vector of numbers.
<!-- ./set/unique.m -->
<p><a name="doc_002dunique"></a>
<div class="defun">
— Function File: <b>unique</b> (<var>x</var>)<var><a name="index-unique-2001"></a></var><br>
— Function File: <b>unique</b> (<var>x, "rows"</var>)<var><a name="index-unique-2002"></a></var><br>
— Function File: <b>unique</b> (<var><small class="dots">...</small>, "first"</var>)<var><a name="index-unique-2003"></a></var><br>
— Function File: <b>unique</b> (<var><small class="dots">...</small>, "last"</var>)<var><a name="index-unique-2004"></a></var><br>
— Function File: [<var>y</var>, <var>i</var>, <var>j</var>] = <b>unique</b> (<var><small class="dots">...</small></var>)<var><a name="index-unique-2005"></a></var><br>
<blockquote><p>Return the unique elements of <var>x</var>, sorted in ascending order.
If <var>x</var> is a row vector, return a row vector, but if <var>x</var>
is a column vector or a matrix return a column vector.
<p>If the optional argument <code>"rows"</code> is supplied, return the unique
rows of <var>x</var>, sorted in ascending order.
<p>If requested, return index vectors <var>i</var> and <var>j</var> such that
<code>x(i)==y</code> and <code>y(j)==x</code>.
<p>Additionally, one of <code>"first"</code> or <code>"last"</code> may be given as
an argument. If <code>"last"</code> is specified, return the highest
possible indices in <var>i</var>, otherwise, if <code>"first"</code> is
specified, return the lowest. The default is <code>"last"</code>.
<!-- Texinfo @sp should work but in practice produces ugly results for HTML. -->
<!-- A simple blank line produces the correct behavior. -->
<!-- @sp 1 -->
<p class="noindent"><strong>See also:</strong> <a href="doc_002dunion.html#doc_002dunion">union</a>, <a href="doc_002dintersect.html#doc_002dintersect">intersect</a>, <a href="doc_002dsetdiff.html#doc_002dsetdiff">setdiff</a>, <a href="doc_002dsetxor.html#doc_002dsetxor">setxor</a>, <a href="doc_002dismember.html#doc_002dismember">ismember</a>.
</p></blockquote></div>
<ul class="menu">
<li><a accesskey="1" href="Set-Operations.html#Set-Operations">Set Operations</a>
</ul>
</body></html>
distrib
>
Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
>
by-pkgid
>
3e60ff9d4d6f58c8fbd17208f14089fa
>
files
>
365
