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Commons Math example source code file (ElitisticListPopulation.java)
The Commons Math ElitisticListPopulation.java source code/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.math.genetics;
import java.util.Collections;
import java.util.List;
/**
* Population of chromosomes which uses elitism (certain percentace of the best
* chromosomes is directly copied to the next generation).
*
* @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
* @since 2.0
*/
public class ElitisticListPopulation extends ListPopulation {
/** percentage of chromosomes copied to the next generation */
private double elitismRate = 0.9;
/**
* Creates a new ElitisticListPopulation instance.
*
* @param chromosomes
* list of chromosomes in the population
* @param populationLimit
* maximal size of the population
* @param elitismRate
* how many best chromosomes will be directly transferred to the
* next generation [in %]
*/
public ElitisticListPopulation(List<Chromosome> chromosomes, int populationLimit, double elitismRate) {
super(chromosomes, populationLimit);
this.elitismRate = elitismRate;
}
/**
* Creates a new ListPopulation instance and initializes its inner
* chromosome list.
*
* @param populationLimit maximal size of the population
* @param elitismRate
* how many best chromosomes will be directly transferred to the
* next generation [in %]
*/
public ElitisticListPopulation(int populationLimit, double elitismRate) {
super(populationLimit);
this.elitismRate = elitismRate;
}
/**
* Start the population for the next generation. The
* <code>{@link #elitismRate}
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