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<!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 1.5.0_10) on Fri Jan 26 16:34:41 NZDT 2007 --><TITLE>PrincipalComponents</TITLE><META NAME="keywords" CONTENT="weka.attributeSelection.PrincipalComponents class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="PrincipalComponents";}</SCRIPT><NOSCRIPT></NOSCRIPT></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=2 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="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/" target="_blank"><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/attributeSelection/OneRAttributeEval.html" title="class in weka.attributeSelection"><B>PREV CLASS</B></A> <A HREF="../../weka/attributeSelection/RaceSearch.html" title="class in weka.attributeSelection"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?weka/attributeSelection/PrincipalComponents.html" target="_top"><B>FRAMES</B></A> <A HREF="PrincipalComponents.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.attributeSelection</FONT><BR>Class PrincipalComponents</H2><PRE>java.lang.Object <IMG SRC="../../resources/inherit.gif" ALT="extended by "><A HREF="../../weka/attributeSelection/ASEvaluation.html" title="class in weka.attributeSelection">weka.attributeSelection.ASEvaluation</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><A HREF="../../weka/attributeSelection/AttributeEvaluator.html" title="class in weka.attributeSelection">weka.attributeSelection.AttributeEvaluator</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><A HREF="../../weka/attributeSelection/UnsupervisedAttributeEvaluator.html" title="class in weka.attributeSelection">weka.attributeSelection.UnsupervisedAttributeEvaluator</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>weka.attributeSelection.PrincipalComponents</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable, <A HREF="../../weka/attributeSelection/AttributeTransformer.html" title="interface in weka.attributeSelection">AttributeTransformer</A>, <A HREF="../../weka/core/CapabilitiesHandler.html" title="interface in weka.core">CapabilitiesHandler</A>, <A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></DD></DL><HR><DL><DT><PRE>public class <B>PrincipalComponents</B><DT>extends <A HREF="../../weka/attributeSelection/UnsupervisedAttributeEvaluator.html" title="class in weka.attributeSelection">UnsupervisedAttributeEvaluator</A><DT>implements <A HREF="../../weka/attributeSelection/AttributeTransformer.html" title="interface in weka.attributeSelection">AttributeTransformer</A>, <A HREF="../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></DL></PRE><P><!-- globalinfo-start --> Performs a principal components analysis and transformation of the data. Use in conjunction with a Ranker search. Dimensionality reduction is accomplished by choosing enough eigenvectors to account for some percentage of the variance in the original data---default 0.95 (95%). Attribute noise can be filtered by transforming to the PC space, eliminating some of the worst eigenvectors, and then transforming back to the original space. <p/> <!-- globalinfo-end --> <!-- options-start --> Valid options are: <p/> <pre> -D Don't normalize input data.</pre> <pre> -R Retain enough PC attributes to account for this proportion of variance in the original data. (default = 0.95)</pre> <pre> -O Transform through the PC space and back to the original space.</pre> <pre> -A Maximum number of attributes to include in transformed attribute names. (-1 = include all)</pre> <!-- options-end --><P><P><DL><DT><B>Version:</B></DT> <DD>$Revision: 1.33 $</DD><DT><B>Author:</B></DT> <DD>Mark Hall (mhall@cs.waikato.ac.nz), Gabi Schmidberger (gabi@cs.waikato.ac.nz)</DD><DT><B>See Also:</B><DD><A HREF="../../serialized-form.html#weka.attributeSelection.PrincipalComponents">Serialized Form</A></DL><HR><P><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#PrincipalComponents()">PrincipalComponents</A></B>()</CODE><BR> </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"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></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/attributeSelection/PrincipalComponents.html#buildEvaluator(weka.core.Instances)">buildEvaluator</A></B>(<A HREF="../../weka/core/Instances.html" title="class in weka.core">Instances</A> data)</CODE><BR> Initializes principal components and performs the analysis</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#convertInstance(weka.core.Instance)">convertInstance</A></B>(<A HREF="../../weka/core/Instance.html" title="class in weka.core">Instance</A> instance)</CODE><BR> Transform an instance in original (unormalized) format.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#evaluateAttribute(int)">evaluateAttribute</A></B>(int att)</CODE><BR> Evaluates the merit of a transformed attribute.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/Capabilities.html" title="class in weka.core">Capabilities</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#getCapabilities()">getCapabilities</A></B>()</CODE><BR> Returns the capabilities of this evaluator.</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/attributeSelection/PrincipalComponents.html#getMaximumAttributeNames()">getMaximumAttributeNames</A></B>()</CODE><BR> Gets maximum number of attributes to include in transformed attribute names.</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/attributeSelection/PrincipalComponents.html#getNormalize()">getNormalize</A></B>()</CODE><BR> Gets whether or not input data is to be normalized</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/attributeSelection/PrincipalComponents.html#getOptions()">getOptions</A></B>()</CODE><BR> Gets the current settings of PrincipalComponents</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/attributeSelection/PrincipalComponents.html#getTransformBackToOriginal()">getTransformBackToOriginal</A></B>()</CODE><BR> Gets whether the data is to be transformed back to the original space.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#getVarianceCovered()">getVarianceCovered</A></B>()</CODE><BR> Gets the proportion of total variance to account for when retaining principal components</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/attributeSelection/PrincipalComponents.html#globalInfo()">globalInfo</A></B>()</CODE><BR> Returns a string describing this attribute transformer</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.util.Enumeration</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/PrincipalComponents.html#listOptions()">listOptions</A></B>()</CODE><BR> Returns an enumeration describing the available options.</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/attributeSelection/PrincipalComponents.html#main(java.lang.String[])">main</A></B>(java.lang.String[] argv)</CODE><BR> Main method for testing this class</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/attributeSelection/PrincipalComponents.html#maximumAttributeNamesTipText()">maximumAttributeNamesTipText</A></B>()</CODE><BR> Returns the tip text for this property</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/attributeSelection/PrincipalComponents.html#normalizeTipText()">normalizeTipText</A></B>()</CODE><BR> Returns the tip text for this property</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/attributeSelection/PrincipalComponents.html#setMaximumAttributeNames(int)">setMaximumAttributeNames</A></B>(int m)</CODE><BR> Sets maximum number of attributes to include in transformed attribute names.</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/attributeSelection/PrincipalComponents.html#setNormalize(boolean)">setNormalize</A></B>(boolean n)</CODE><BR> Set whether input data will be normalized.</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/attributeSelection/PrincipalComponents.html#setOptions(java.lang.String[])">setOptions</A></B>(java.lang.String[] options)</CODE><BR> Parses a given list of options.</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/attributeSelection/PrincipalComponents.html#setTransformBackToOriginal(boolean)">setTransformBackToOriginal</A></B>(boolean b)</CODE><BR>⌨️ 快捷键说明
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