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source: trunk/sources/HeuristicLab.BitVector/3.2/SinglePointCrossover.cs @ 1529

Last change on this file since 1529 was 1529, checked in by gkronber, 15 years ago

Moved source files of plugins AdvancedOptimizationFrontEnd ... Grid into version-specific sub-folders. #576

File size: 3.0 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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 System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Core;
26
27namespace HeuristicLab.BitVector {
28  /// <summary>
29  /// Single point crossover for bit vectors.
30  /// </summary>
31  public class SinglePointCrossover : BitVectorCrossoverBase {
32    /// <inheritdoc select="summary"/>
33    public override string Description {
34      get { return "Single point crossover for bit vectors."; }
35    }
36
37    /// <summary>
38    /// Performs a single point crossover at a randomly chosen position of the two
39    /// given parent bit vectors.
40    /// </summary>
41    /// <param name="random">A random number generator.</param>
42    /// <param name="parent1">The first parent for crossover.</param>
43    /// <param name="parent2">The second parent for crossover.</param>
44    /// <returns>The newly created bit vector, resulting from the single point crossover.</returns>
45    public static bool[] Apply(IRandom random, bool[] parent1, bool[] parent2) {
46      int length = parent1.Length;
47      bool[] result = new bool[length];
48      int breakPoint = random.Next(1, length);
49
50      for (int i = 0; i < breakPoint; i++)
51        result[i] = parent1[i];
52      for (int i = breakPoint; i < length; i++)
53        result[i] = parent2[i];
54
55      return result;
56    }
57
58    /// <summary>
59    /// Performs a single point crossover at a randomly chosen position of two
60    /// given parent bit vectors.
61    /// </summary>
62    /// <exception cref="InvalidOperationException">Thrown if there are not exactly two parents.</exception>
63    /// <param name="scope">The current scope.</param>
64    /// <param name="random">A random number generator.</param>
65    /// <param name="parents">An array containing the two bit vectors that should be crossed.</param>
66    /// <returns>The newly created bit vector, resulting from the single point crossover.</returns>
67    protected override bool[] Cross(IScope scope, IRandom random, bool[][] parents) {
68      if (parents.Length != 2) throw new InvalidOperationException("ERROR in SinglePointCrossover: The number of parents is not equal to 2");
69      return Apply(random, parents[0], parents[1]);
70    }
71  }
72}
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