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<TITLE>GNU Octave - Sets</TITLE>
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<H1><A NAME="SEC159" HREF="octave_toc.html#TOC159">Sets</A></H1>
<P>
Octave has a limited set of functions for managing sets of data, where a
set is defined as a collection unique elements.
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<P>
<DL>
<DT><U>Function File:</U> <B>create_set</B> <I>(<VAR>x</VAR>)</I>
<DD><A NAME="IDX772"></A>
Return a row vector containing the unique values in <VAR>x</VAR>, sorted in
ascending order. For example,
</P>
<PRE>
create_set ([ 1, 2; 3, 4; 4, 2 ])
=> [ 1, 2, 3, 4 ]
</PRE>
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<DL>
<DT><U>Function File:</U> <B>union</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD><A NAME="IDX773"></A>
Return the set of elements that are in either of the sets <VAR>x</VAR> and
<VAR>y</VAR>. For example,
</P>
<PRE>
union ([ 1, 2, 4 ], [ 2, 3, 5 ])
=> [ 1, 2, 3, 4, 5 ]
</PRE>
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<DT><U>Function File:</U> <B>intersection</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD><A NAME="IDX774"></A>
Return the set of elements that are in both sets <VAR>x</VAR> and <VAR>y</VAR>.
For example,
</P>
<PRE>
intersection ([ 1, 2, 3 ], [ 2, 3, 5 ])
=> [ 2, 3 ]
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<DT><U>Function File:</U> <B>complement</B> <I>(<VAR>x</VAR>, <VAR>y</VAR>)</I>
<DD><A NAME="IDX775"></A>
Return the elements of set <VAR>y</VAR> that are not in set <VAR>x</VAR>. For
example,
</P>
<PRE>
complement ([ 1, 2, 3 ], [ 2, 3, 5 ])
=> 5
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