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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_13) on Mon Jul 14 01:36:53 CEST 2008 --><TITLE>RankSelection (RapidMiner Class Documentation)</TITLE><META NAME="keywords" CONTENT="com.rapidminer.tools.math.optimization.ec.es.RankSelection class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="RankSelection (RapidMiner Class Documentation)";}</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="class-use/RankSelection.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </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> </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="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/PopulationPlotter.html" title="class in com.rapidminer.tools.math.optimization.ec.es"><B>PREV CLASS</B></A> <A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/RouletteWheel.html" title="class in com.rapidminer.tools.math.optimization.ec.es"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../../../index.html?com/rapidminer/tools/math/optimization/ec/es/RankSelection.html" target="_top"><B>FRAMES</B></A> <A HREF="RankSelection.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">com.rapidminer.tools.math.optimization.ec.es</FONT><BR>Class RankSelection</H2><PRE>java.lang.Object <IMG SRC="../../../../../../../resources/inherit.gif" ALT="extended by "><B>com.rapidminer.tools.math.optimization.ec.es.RankSelection</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/PopulationOperator.html" title="interface in com.rapidminer.tools.math.optimization.ec.es">PopulationOperator</A></DD></DL><HR><DL><DT><PRE>public class <B>RankSelection</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/PopulationOperator.html" title="interface in com.rapidminer.tools.math.optimization.ec.es">PopulationOperator</A></DL></PRE><P>Selects a given fixed number of individuals by subdividing a roulette wheel in sections of size proportional to the individuals' rank based on their fitness values. Optionally keep the best individual. Since the individuals are sorted accordingly to their rank this selection operator needs m log m time for population size m.<P><P><DL><DT><B>Version:</B></DT> <DD>$Id: RankSelection.java,v 1.3 2008/05/09 19:23:16 ingomierswa Exp $</DD><DT><B>Author:</B></DT> <DD>Ingo Mierswa</DD></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="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/RankSelection.html#RankSelection(int, boolean, java.util.Random)">RankSelection</A></B>(int popSize, boolean keepBest, java.util.Random random)</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="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/RankSelection.html#operate(com.rapidminer.tools.math.optimization.ec.es.Population)">operate</A></B>(<A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/Population.html" title="class in com.rapidminer.tools.math.optimization.ec.es">Population</A> population)</CODE><BR> </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="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/RankSelection.html#performOperation(int)">performOperation</A></B>(int generation)</CODE><BR> The default implementation returns true for every generation.</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"><TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TH></TR></TABLE><A NAME="RankSelection(int, boolean, java.util.Random)"><!-- --></A><H3>RankSelection</H3><PRE>public <B>RankSelection</B>(int popSize, boolean keepBest, java.util.Random random)</PRE><DL></DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="performOperation(int)"><!-- --></A><H3>performOperation</H3><PRE>public boolean <B>performOperation</B>(int generation)</PRE><DL><DD>The default implementation returns true for every generation.<P><DD><DL></DL></DD><DD><DL></DL></DD></DL><HR><A NAME="operate(com.rapidminer.tools.math.optimization.ec.es.Population)"><!-- --></A><H3>operate</H3><PRE>public void <B>operate</B>(<A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/Population.html" title="class in com.rapidminer.tools.math.optimization.ec.es">Population</A> population)</PRE><DL><DD><DL><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/PopulationOperator.html#operate(com.rapidminer.tools.math.optimization.ec.es.Population)">operate</A></CODE> in interface <CODE><A HREF="../../../../../../../com/rapidminer/tools/math/optimization/ec/es/PopulationOperator.html" title="interface in com.rapidminer.tools.math.optimization.ec.es">PopulationOperator</A></CODE></DL></DD><DD><DL></DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" 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_bottom_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 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