itemset.html

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<PRE>
public final boolean <B>containedBy</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Checks if an instance contains an item set.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance to be tested
<DT><B>Returns:</B><DD>true if the given instance contains this item set</DL>
</DD>
</DL>
<HR>

<A NAME="deleteItemSets(weka.core.FastVector, int, int)"><!-- --></A><H3>
deleteItemSets</H3>
<PRE>
public static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> <B>deleteItemSets</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>&nbsp;itemSets,
                                        int&nbsp;minSupport,
                                        int&nbsp;maxSupport)</PRE>
<DL>
<DD>Deletes all item sets that don't have minimum support.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maxSupport</CODE> - the maximum support<DD><CODE>itemSets</CODE> - the set of item sets to be pruned<DD><CODE>minSupport</CODE> - the minimum number of transactions to be covered
<DT><B>Returns:</B><DD>the reduced set of item sets</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object&nbsp;itemSet)</PRE>
<DL>
<DD>Tests if two item sets are equal.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>itemSet</CODE> - another item set
<DT><B>Returns:</B><DD>true if this item set contains the same items as the given one</DL>
</DD>
</DL>
<HR>

<A NAME="getHashtable(weka.core.FastVector, int)"><!-- --></A><H3>
getHashtable</H3>
<PRE>
public static java.util.Hashtable <B>getHashtable</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>&nbsp;itemSets,
                                               int&nbsp;initialSize)</PRE>
<DL>
<DD>Return a hashtable filled with the given item sets.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>itemSets</CODE> - the set of item sets to be used for filling the hash table<DD><CODE>initialSize</CODE> - the initial size of the hashtable
<DT><B>Returns:</B><DD>the generated hashtable</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public final int <B>hashCode</B>()</PRE>
<DL>
<DD>Produces a hash code for a item set.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a hash code for a set of items</DL>
</DD>
</DL>
<HR>

<A NAME="mergeAllItemSets(weka.core.FastVector, int, int)"><!-- --></A><H3>
mergeAllItemSets</H3>
<PRE>
public static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> <B>mergeAllItemSets</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>&nbsp;itemSets,
                                          int&nbsp;size,
                                          int&nbsp;totalTrans)</PRE>
<DL>
<DD>Merges all item sets in the set of (k-1)-item sets
 to create the (k)-item sets and updates the counters.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>totalTrans</CODE> - thetotal number of transactions<DD><CODE>itemSets</CODE> - the set of (k-1)-item sets<DD><CODE>size</CODE> - the value of (k-1)
<DT><B>Returns:</B><DD>the generated (k)-item sets</DL>
</DD>
</DL>
<HR>

<A NAME="pruneItemSets(weka.core.FastVector, java.util.Hashtable)"><!-- --></A><H3>
pruneItemSets</H3>
<PRE>
public static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> <B>pruneItemSets</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>&nbsp;toPrune,
                                       java.util.Hashtable&nbsp;kMinusOne)</PRE>
<DL>
<DD>Prunes a set of (k)-item sets using the given (k-1)-item sets.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>toPrune</CODE> - the set of (k)-item sets to be pruned<DD><CODE>kMinusOne</CODE> - the (k-1)-item sets to be used for pruning
<DT><B>Returns:</B><DD>the pruned set of item sets</DL>
</DD>
</DL>
<HR>

<A NAME="pruneRules(weka.core.FastVector[], double)"><!-- --></A><H3>
pruneRules</H3>
<PRE>
public static void <B>pruneRules</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>[]&nbsp;rules,
                              double&nbsp;minConfidence)</PRE>
<DL>
<DD>Prunes a set of rules.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rules</CODE> - a two-dimensional array of lists of item sets. The first list
 of item sets contains the premises, the second one the consequences.<DD><CODE>minConfidence</CODE> - the minimum confidence the rules have to have</DL>
</DD>
</DL>
<HR>

<A NAME="singletons(weka.core.Instances)"><!-- --></A><H3>
singletons</H3>
<PRE>
public static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> <B>singletons</B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances)
                             throws java.lang.Exception</PRE>
<DL>
<DD>Converts the header info of the given set of instances into a set 
 of item sets (singletons). The ordering of values in the header file 
 determines the lexicographic order.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - the set of instances whose header info is to be used
<DT><B>Returns:</B><DD>a set of item sets, each containing a single item
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if singletons can't be generated successfully</DL>
</DD>
</DL>
<HR>

<A NAME="support()"><!-- --></A><H3>
support</H3>
<PRE>
public int <B>support</B>()</PRE>
<DL>
<DD>Outputs the support for an item set.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the support</DL>
</DD>
</DL>
<HR>

<A NAME="toString(weka.core.Instances)"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances)</PRE>
<DL>
<DD>Returns the contents of an item set as a string.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instances</CODE> - contains the relevant header information
<DT><B>Returns:</B><DD>string describing the item set</DL>
</DD>
</DL>
<HR>

<A NAME="upDateCounter(weka.core.Instance)"><!-- --></A><H3>
upDateCounter</H3>
<PRE>
public void <B>upDateCounter</B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)</PRE>
<DL>
<DD>Updates counter of item set with respect to given transaction.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance to be used for ubdating the counter</DL>
</DD>
</DL>
<HR>

<A NAME="upDateCounters(weka.core.FastVector, weka.core.Instances)"><!-- --></A><H3>
upDateCounters</H3>
<PRE>
public static void <B>upDateCounters</B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>&nbsp;itemSets,
                                  <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;instances)</PRE>
<DL>
<DD>Updates counters for a set of item sets and a set of instances.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>itemSets</CODE> - the set of item sets which are to be updated<DD><CODE>instances</CODE> - the instances to be used for updating the counters</DL>
</DD>
</DL>
<HR>

<A NAME="counter()"><!-- --></A><H3>
counter</H3>
<PRE>
public int <B>counter</B>()</PRE>
<DL>
<DD>Gets the counter
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the counter</DL>
</DD>
</DL>
<HR>

<A NAME="items()"><!-- --></A><H3>
items</H3>
<PRE>
public int[] <B>items</B>()</PRE>
<DL>
<DD>Gest the item set as an int array
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>int array represneting an item set</DL>
</DD>
</DL>
<HR>

<A NAME="itemAt(int)"><!-- --></A><H3>
itemAt</H3>
<PRE>
public int <B>itemAt</B>(int&nbsp;k)</PRE>
<DL>
<DD>Gest the index of the value of the specified attribute
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>k</CODE> - the attribute index
<DT><B>Returns:</B><DD>the index of the attribute value</DL>
</DD>
</DL>
<HR>

<A NAME="setCounter(int)"><!-- --></A><H3>
setCounter</H3>
<PRE>
public void <B>setCounter</B>(int&nbsp;count)</PRE>
<DL>
<DD>Sets the counter
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>count</CODE> - the counter</DL>
</DD>
</DL>
<HR>

<A NAME="setItem(int[])"><!-- --></A><H3>
setItem</H3>
<PRE>
public void <B>setItem</B>(int[]&nbsp;items)</PRE>
<DL>
<DD>Sets an item sets
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>items</CODE> - an int array representing an item set</DL>
</DD>
</DL>
<HR>

<A NAME="setItemAt(int, int)"><!-- --></A><H3>
setItemAt</H3>
<PRE>
public void <B>setItemAt</B>(int&nbsp;value,
                      int&nbsp;k)</PRE>
<DL>
<DD>Sets the index of an attribute value
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the inex of the attribute value<DD><CODE>k</CODE> - the index of the attribute</DL>
</DD>
</DL>
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