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<H1> 27. Sets </H1>
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<P>
Octave has a limited set of functions for managing sets of data, where a
set is defined as a collection unique elements.
</P>
<P>
<A NAME="doc-create_set"></A>
<A NAME="IDX955"></A>
</P>
<DL>
<DT><U>Function File:</U> <B>create_set</B> <I>(<VAR>x</VAR>)</I>
<DD>Return a row vector containing the unique values in <VAR>x</VAR>, sorted in
ascending order. For example,
<P>
<TABLE><tr><td> </td><td class=example><pre>create_set ([ 1, 2; 3, 4; 4, 2 ])
=> [ 1, 2, 3, 4 ]
</pre></td></tr></table></DL>
<P>
<A NAME="doc-union"></A>
<A NAME="IDX956"></A>
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<DL>
<DT><U>Function File:</U> <B>union</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD>Return the set of elements that are in either of the sets <VAR>x</VAR> and
<VAR>y</VAR>. For example,
<P>
<TABLE><tr><td> </td><td class=example><pre>union ([ 1, 2, 4 ], [ 2, 3, 5 ])
=> [ 1, 2, 3, 4, 5 ]
</pre></td></tr></table></DL>
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<A NAME="doc-intersection"></A>
<A NAME="IDX957"></A>
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<DL>
<DT><U>Function File:</U> <B>intersection</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD>Return the set of elements that are in both sets <VAR>x</VAR> and <VAR>y</VAR>.
For example,
<P>
<TABLE><tr><td> </td><td class=example><pre>intersection ([ 1, 2, 3 ], [ 2, 3, 5 ])
=> [ 2, 3 ]
</pre></td></tr></table></DL>
<P>
<A NAME="doc-complement"></A>
<A NAME="IDX958"></A>
</P>
<DL>
<DT><U>Function File:</U> <B>complement</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD>Return the elements of set <VAR>y</VAR> that are not in set <VAR>x</VAR>. For
example,
<P>
<TABLE><tr><td> </td><td class=example><pre>complement ([ 1, 2, 3 ], [ 2, 3, 5 ])
=> 5
</pre></td></tr></table></DL>
<P>
<A NAME="Polynomial Manipulations"></A>
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