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File org.dgpf.search.algorithms.ga.selection.RouletteWheelSelection.java

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 * Copyright (c) 2006 Thomas Weise
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-05-28 09:23:35
 * Original Filename: org.dgpf.search.algorithms.ga.selection.RouletteWheelSelection.java
 * Version          : 1.0.1
 * Last modification: 2006-05-31
 *                by: Thomas Weise
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 * Warranty         : This software is provided "as is" without any
 *                    warranty; without even the implied warranty of
 *                    merchantability or fitness for a particular purpose.
 *                    See the Gnu Lesser General Public License for more
 *                    details.

package org.dgpf.search.algorithms.ga.selection;

import java.io.Serializable;

import org.dgpf.search.algorithms.ga.SelectionAlgorithm;
import org.dgpf.search.algorithms.ga.sorting.ScalarSorting;
import org.dgpf.search.api.Individual;
import org.sfc.math.stochastic.Randomizer;

 * The roulette wheel selection algorithm is a commonly known appreciated
 * technique for selection.
 * Find more information at
 * <a href="http://en.wikipedia.org/wiki/Fitness_proportionate_selection">http://en.wikipedia.org/wiki/Fitness_proportionate_selection</a>. 
 * @author Thomas Weise

public final  class RouletteWheelSelection extends SelectionAlgorithm
 * The serial version uid.

  private   static  final long    serialVersionUID        = 1;

 * The roulette wheel selection instance.

  public  static  final SelectionAlgorithm INSTANCE
      = new RouletteWheelSelection();
 * Create a new instance of roulette wheel selection.

  private RouletteWheelSelection()
    super(new ScalarSorting());

 * Select one individual out of the population for reproduction (crossover
 * or mutation). The individuals in the array are ordered by the search's
 * current comparator, with the fittest individual at index <code>0</code>
 * and the worst at index <code>p_count-1</code>.
 * @param p_random        The randomizer to be used for the selection.
 * @param p_individuals   The population of individuals after being
 *                        preprocessed.
 * @param p_count         The count of valid items inside the population
 *                        array.
 * @param <Genotype>      The genotype of the individuals to select.
 * @return  An individual to reproduce.

  public  final  <Genotype extends Serializable> Individual<Genotype>
                         select(final Randomizer             p_random,
                                final Individual<Genotype>[] p_individuals,
                                final int                    p_count)
    return p_individuals[((ScalarSorting)(this.get_sorting_algorithm()))
                          .get_norm_index(p_random.nextDouble(), p_count)];

 * Check whether this object equals another one. This method is internally
 * invoked by <code>equals()</code>. 
 * @param p_object  The object to compare with.
 * @return <code>true</code> if and only if this object equals to the other
 *         one.

  protected final boolean is_equal  (final Object p_object)
    return (p_object instanceof RouletteWheelSelection);

File Information:

file name:RouletteWheelSelection.java
qualified name:org.dgpf.search.algorithms.ga.selection.RouletteWheelSelection.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/search/algorithms/ga/selection/RouletteWheelSelection.java
size:3.726 KB (3816 B)
uploaded: 2018-01-07 12:03:35 GMT+0000
last update: 2006-08-22 13:05:50 GMT+0000
last access: 2018-04-26 11:23:47 GMT+0000

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