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Commons Math example source code file (BinaryMutation.java)

This example Commons Math source code file (BinaryMutation.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

binary, binary, binarychromosome, binarychromosome, binarymutation, chromosome, chromosome, illegalargumentexception, list, mutationpolicy, mutationpolicy, util

The Commons Math BinaryMutation.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.ArrayList;
import java.util.List;

/**
 * Mutation for {@link BinaryChromosome}s. Randomly changes one gene.
 *
 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
 * @since 2.0
 */
public class BinaryMutation implements MutationPolicy {

    /**
     * Mutate the given chromosome. Randomly changes one gene.
     * @param original the original chromosome.
     * @return the mutated chromomsome.
     */
    public Chromosome mutate(Chromosome original) {
        if (!(original instanceof BinaryChromosome)) {
            throw new IllegalArgumentException("Binary mutation works on BinaryChromosome only.");
        }

        BinaryChromosome origChrom = (BinaryChromosome) original;
        List<Integer> newRepr = new ArrayList(origChrom.getRepresentation());

        // randomly select a gene
        int geneIndex = GeneticAlgorithm.getRandomGenerator().nextInt(origChrom.getLength());
        // and change it
        newRepr.set(geneIndex, origChrom.getRepresentation().get(geneIndex) == 0 ? 1 : 0);

        Chromosome newChrom = origChrom.newFixedLengthChromosome(newRepr);
        return newChrom;
    }

}

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math BinaryMutation.java source code file:

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