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Commons Math example source code file (

This example Commons Math source code file ( is included in the "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 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * 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 source code file:

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