source: branches/GeneralizedQAP/HeuristicLab.Encodings.IntegerVectorEncoding/3.3/Crossovers/SinglePointCrossover.cs @ 15605

Last change on this file since 15605 was 15605, checked in by abeham, 20 months ago

#1614: merged trunk into branch

File size: 3.9 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using HeuristicLab.Common;
24using HeuristicLab.Core;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Encodings.IntegerVectorEncoding {
28  /// <summary>
29  /// Single point crossover for integer vectors.
30  /// </summary>
31  /// <remarks>
32  /// It is implemented as described in Michalewicz, Z. 1999. Genetic Algorithms + Data Structures = Evolution Programs. Third, Revised and Extended Edition, Spring-Verlag Berlin Heidelberg.
33  /// </remarks>
34  [Item("SinglePointCrossover", "Single point crossover for integer vectors. It is implemented as described in Michalewicz, Z. 1999. Genetic Algorithms + Data Structures = Evolution Programs. Third, Revised and Extended Edition, Spring-Verlag Berlin Heidelberg.")]
35  [StorableClass]
36  public class SinglePointCrossover : IntegerVectorCrossover {
37    [StorableConstructor]
38    protected SinglePointCrossover(bool deserializing) : base(deserializing) { }
39    protected SinglePointCrossover(SinglePointCrossover original, Cloner cloner) : base(original, cloner) { }
40    public SinglePointCrossover() : base() { }
41
42    public override IDeepCloneable Clone(Cloner cloner) {
43      return new SinglePointCrossover(this, cloner);
44    }
45
46    /// <summary>
47    /// Performs a single point crossover at a randomly chosen position of the two
48    /// given parent integer vectors.
49    /// </summary>
50    /// <param name="random">A random number generator.</param>
51    /// <param name="parent1">The first parent for crossover.</param>
52    /// <param name="parent2">The second parent for crossover.</param>
53    /// <returns>The newly created integer vector, resulting from the single point crossover.</returns>
54    public static IntegerVector Apply(IRandom random, IntegerVector parent1, IntegerVector parent2) {
55      if (parent1.Length != parent2.Length)
56        throw new ArgumentException("SinglePointCrossover: The parents are of different length.");
57
58      int length = parent1.Length;
59      int[] result = new int[length];
60      int breakPoint = random.Next(1, length);
61
62      for (int i = 0; i < breakPoint; i++)
63        result[i] = parent1[i];
64      for (int i = breakPoint; i < length; i++)
65        result[i] = parent2[i];
66
67      return new IntegerVector(result);
68    }
69
70    /// <summary>
71    /// Performs a single point crossover at a randomly chosen position of two
72    /// given parent integer vectors.
73    /// </summary>
74    /// <exception cref="ArgumentException">Thrown if there are not exactly two parents.</exception>
75    /// <param name="random">A random number generator.</param>
76    /// <param name="parents">An array containing the two integer vectors that should be crossed.</param>
77    /// <returns>The newly created integer vector, resulting from the single point crossover.</returns>
78    protected override IntegerVector Cross(IRandom random, ItemArray<IntegerVector> parents) {
79      if (parents.Length != 2) throw new ArgumentException("ERROR in SinglePointCrossover: The number of parents is not equal to 2");
80      return Apply(random, parents[0], parents[1]);
81    }
82  }
83}
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