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<table width="100%" summary="page for itemsets-class {arules}"><tr><td>itemsets-class {arules}</td><td align="right">R Documentation</td></tr></table>
<h2>Class “itemsets” — A Set of Itemsets</h2>
<h3>Description</h3>
<p>
The <code>itemsets</code> class represents a set of itemsets and the associated
quality measures.
</p>
<p>
Note that the class can also represent a multiset of itemsets with duplicated
elements. Duplicated elements can be removed with <code><a href="unique.html">unique</a></code>.
</p>
<h3>Objects from the Class</h3>
<p>
Objects are the result of calling the functions <code><a href="apriori.html">apriori</a></code>
(e.g., with <code>target="frequent itemsets"</code> in the parameter list)
or <code><a href="eclat.html">eclat</a></code>.
Objects can also be created by calls of the form
<code>new("itemsets", ...)</code>.
</p>
<h3>Slots</h3>
<dl>
<dt><code>items</code>:</dt><dd>object of class
<code><a href="itemMatrix-class.html">itemMatrix</a></code> containing the
items in the set of itemsets</dd>
<dt><code>quality</code>:</dt><dd>a data.frame
containing the quality measures for the itemsets</dd>
<dt><code>tidLists</code>:</dt><dd>object of class
<code><a href="tidLists-class.html">tidLists</a></code> containing the IDs of the
transactions which support each itemset. The slot contains
<code>NULL</code> if no transactions ID list is available (transactions
ID lists are only available for <code><a href="eclat.html">eclat</a></code>).
</dd>
</dl>
<h3>Extends</h3>
<p>
Class <code><a href="associations-class.html">associations</a></code>, directly.
</p>
<h3>Methods</h3>
<dl>
<dt>coerce</dt><dd><code>signature(from = "itemsets", to =
"data.frame")</code>;
represent the itemsets in readable form</dd>
<dt>items</dt><dd><code>signature(x = "itemsets")</code>;
returns the <code><a href="itemMatrix-class.html">itemMatrix</a></code>
representing the set of itemsets</dd>
<dt>items<-</dt><dd><code>signature(x = "itemsets")</code>;
replaces the <code><a href="itemMatrix-class.html">itemMatrix</a></code>
representing the set of itemsets</dd>
<dt>itemInfo</dt><dd><code>signature(object = "itemsets")</code>;
returns the whole item information data frame including item
labels</dd>
<dt>labels</dt><dd><code>signature(object = "itemsets")</code>;
returns labels for the itemsets as a
character vector. The labels have te following format:
"{item1, item2,..., itemn}"</dd>
<dt>itemLabels</dt><dd><code>signature(object = "itemsets")</code>;
returns the item labels used to encode the itemsets as
a character vector. The index for each lable is the column
index of the item in the binary matrix.</dd>
<dt>summary</dt><dd><code>signature(object = "itemsets")</code></dd>
<dt>tidLists</dt><dd><code>signature(object = "itemsets")</code>;
returns the transaction ID list</dd>
</dl>
<h3>See Also</h3>
<p>
<code><a href="Xtrct-methods.html">[-methods</a></code>,
<code><a href="apriori.html">apriori</a></code>,
<code><a href="combine.html">c</a></code>,
<code><a href="duplicated.html">duplicated</a></code>,
<code><a href="eclat.html">eclat</a></code>,
<code><a href="inspect.html">inspect</a></code>,
<code><a href="is.maximal.html">is.maximal</a></code>,
<code><a href="length.html">length</a></code>,
<code><a href="match.html">match</a></code>,
<code><a href="sets.html">sets</a></code>,
<code><a href="size.html">size</a></code>,
<code><a href="subset.html">subset</a></code>,
<code><a href="associations-class.html">associations-class</a></code>,
<code><a href="tidLists-class.html">tidLists-class</a></code>
</p>
<h3>Examples</h3>
<pre>
data("Adult")
## Mine frequent itemsets with Eclat.
fsets <- eclat(Adult, parameter = list(supp = 0.5))
## Display the 5 itemsets with the highest support.
fsets.top5 <- SORT(fsets)[1:5]
inspect(fsets.top5)
## Get the itemsets as a list
as(items(fsets.top5), "list")
## Get the itemsets as a binary matrix
as(items(fsets.top5), "matrix")
## Get the itemsets as a sparse matrix, a ngCMatrix from package Matrix.
## Warning: for efficiency reasons, the ngCMatrix you get is transposed
as(items(fsets.top5), "ngCMatrix")
</pre>
<hr><div align="center">[Package <em>arules</em> version 0.6-6 <a href="00Index.html">Index]</a></div>
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