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<a name="Sets-1"></a>
<h2 class="chapter">27 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.
</p>
<a name="XREFunique"></a><dl>
<dt><a name="index-unique"></a>Function File: <em></em> <strong>unique</strong> <em>(<var>x</var>)</em></dt>
<dt><a name="index-unique-1"></a>Function File: <em></em> <strong>unique</strong> <em>(<var>x</var>, "rows")</em></dt>
<dt><a name="index-unique-2"></a>Function File: <em></em> <strong>unique</strong> <em>(…, "first")</em></dt>
<dt><a name="index-unique-3"></a>Function File: <em></em> <strong>unique</strong> <em>(…, "last")</em></dt>
<dt><a name="index-unique-4"></a>Function File: <em>[<var>y</var>, <var>i</var>, <var>j</var>] =</em> <strong>unique</strong> <em>(…)</em></dt>
<dd><p>Return the unique elements of <var>x</var>, sorted in ascending order.
If the input <var>x</var> is a vector then the output is also a vector with the
same orientation (row or column) as the input. For a matrix input the
output is always a column vector. <var>x</var> may also be a cell array of
strings.
</p>
<p>If the optional argument <code>"rows"</code> is supplied, return the unique
rows of <var>x</var>, sorted in ascending order.
</p>
<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>
<p>Additionally, if <var>i</var> is a requested output then one of <code>"first"</code> or
<code>"last"</code> may be given as an input. 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>.
</p>
<p><strong>See also:</strong> <a href="Set-Operations.html#XREFunion">union</a>, <a href="Set-Operations.html#XREFintersect">intersect</a>, <a href="Set-Operations.html#XREFsetdiff">setdiff</a>, <a href="Set-Operations.html#XREFsetxor">setxor</a>, <a href="Set-Operations.html#XREFismember">ismember</a>.
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