📄 itemset.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_05) on Mon Mar 07 15:27:04 NZDT 2005 --><TITLE>ItemSet</TITLE><META NAME="keywords" CONTENT="weka.associations.ItemSet class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="ItemSet";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../Tutorial.pdf"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/index.html"><FONT CLASS="NavBarFont1"><B>Weka's home</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../weka/associations/Associator.html" title="class in weka.associations"><B>PREV CLASS</B></A> <A HREF="../../weka/associations/LabeledItemSet.html" title="class in weka.associations"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="ItemSet.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">weka.associations</FONT><BR>Class ItemSet</H2><PRE>java.lang.Object <IMG SRC="../../resources/inherit.gif" ALT="extended by"><B>weka.associations.ItemSet</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../weka/associations/AprioriItemSet.html" title="class in weka.associations">AprioriItemSet</A>, <A HREF="../../weka/associations/LabeledItemSet.html" title="class in weka.associations">LabeledItemSet</A></DD></DL><HR><DL><DT>public class <B>ItemSet</B><DT>extends java.lang.Object<DT>implements java.io.Serializable</DL><P>Class for storing a set of items. Item sets are stored in a lexicographic order, which is determined by the header information of the set of instances used for generating the set of items. All methods in this class assume that item sets are stored in lexicographic order. The class provides the general methods used for item sets in class - and standard association rule mining.<P><P><DL><DT><B>Version:</B></DT> <DD>$Revision: 1.10 $</DD><DT><B>Author:</B></DT> <DD>Eibe Frank (eibe@cs.waikato.ac.nz)</DD><DT><B>See Also:</B><DD><A HREF="../../serialized-form.html#weka.associations.ItemSet">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#ItemSet(int)">ItemSet</A></B>(int totalTrans)</CODE><BR> Constructor</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#ItemSet(int[])">ItemSet</A></B>(int[] array)</CODE><BR> Contsructor</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#ItemSet(int, int[])">ItemSet</A></B>(int totalTrans, int[] array)</CODE><BR> Constructor</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#containedBy(weka.core.Instance)">containedBy</A></B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A> instance)</CODE><BR> Checks if an instance contains an item set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#counter()">counter</A></B>()</CODE><BR> Gets the counter</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#deleteItemSets(weka.core.FastVector, int, int)">deleteItemSets</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> itemSets, int minSupport, int maxSupport)</CODE><BR> Deletes all item sets that don't have minimum support.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#equals(java.lang.Object)">equals</A></B>(java.lang.Object itemSet)</CODE><BR> Tests if two item sets are equal.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.util.Hashtable</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#getHashtable(weka.core.FastVector, int)">getHashtable</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> itemSets, int initialSize)</CODE><BR> Return a hashtable filled with the given item sets.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#hashCode()">hashCode</A></B>()</CODE><BR> Produces a hash code for a item set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#itemAt(int)">itemAt</A></B>(int k)</CODE><BR> Gest the index of the value of the specified attribute</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#items()">items</A></B>()</CODE><BR> Gest the item set as an int array</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#mergeAllItemSets(weka.core.FastVector, int, int)">mergeAllItemSets</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> itemSets, int size, int totalTrans)</CODE><BR> Merges all item sets in the set of (k-1)-item sets to create the (k)-item sets and updates the counters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#pruneItemSets(weka.core.FastVector, java.util.Hashtable)">pruneItemSets</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> toPrune, java.util.Hashtable kMinusOne)</CODE><BR> Prunes a set of (k)-item sets using the given (k-1)-item sets.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#pruneRules(weka.core.FastVector[], double)">pruneRules</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A>[] rules, double minConfidence)</CODE><BR> Prunes a set of rules.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#setCounter(int)">setCounter</A></B>(int count)</CODE><BR> Sets the counter</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#setItem(int[])">setItem</A></B>(int[] items)</CODE><BR> Sets an item sets</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#setItemAt(int, int)">setItemAt</A></B>(int value, int k)</CODE><BR> Sets the index of an attribute value</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#singletons(weka.core.Instances)">singletons</A></B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> instances)</CODE><BR> Converts the header info of the given set of instances into a set of item sets (singletons).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#support()">support</A></B>()</CODE><BR> Outputs the support for an item set.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#toString(weka.core.Instances)">toString</A></B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> instances)</CODE><BR> Returns the contents of an item set as a string.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#upDateCounter(weka.core.Instance)">upDateCounter</A></B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A> instance)</CODE><BR> Updates counter of item set with respect to given transaction.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/associations/ItemSet.html#upDateCounters(weka.core.FastVector, weka.core.Instances)">upDateCounters</A></B>(<A HREF="../../weka/core/FastVector.html" title="class in weka.core">FastVector</A> itemSets, <A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> instances)</CODE><BR> Updates counters for a set of item sets and a set of instances.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>getClass, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="ItemSet(int)"><!-- --></A><H3>ItemSet</H3><PRE>public <B>ItemSet</B>(int totalTrans)</PRE><DL><DD>Constructor<P><DT><B>Parameters:</B><DD><CODE>totalTrans</CODE> - the total number of transactions in the data</DL><HR><A NAME="ItemSet(int, int[])"><!-- --></A><H3>ItemSet</H3><PRE>public <B>ItemSet</B>(int totalTrans, int[] array)</PRE><DL><DD>Constructor<P><DT><B>Parameters:</B><DD><CODE>totalTrans</CODE> - the total number of transactions in the data<DD><CODE>array</CODE> - the attribute values encoded in an int array</DL><HR><A NAME="ItemSet(int[])"><!-- --></A><H3>ItemSet</H3><PRE>public <B>ItemSet</B>(int[] array)</PRE><DL><DD>Contsructor<P><DT><B>Parameters:</B><DD><CODE>array</CODE> - the item set represented as an int array</DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="containedBy(weka.core.Instance)"><!-- --></A><H3>containedBy</H3>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -