1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Text;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Data;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 |
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30 | namespace HeuristicLab.Encodings.IntegerVectorEncoding {
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31 | /// <summary>
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32 | /// Single point crossover for integer vectors.
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33 | /// </summary>
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34 | /// <remarks>
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35 | /// It is implemented as described in Michalewicz, Z. 1999. Genetic Algorithms + Data Structures = Evolution Programs. Third, Revised and Extended Edition, Spring-Verlag Berlin Heidelberg.
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36 | /// </remarks>
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37 | [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.")]
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38 | [StorableClass]
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39 | public class SinglePointCrossover : IntegerVectorCrossover {
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40 | /// <summary>
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41 | /// Performs a single point crossover at a randomly chosen position of the two
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42 | /// given parent integer vectors.
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43 | /// </summary>
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44 | /// <param name="random">A random number generator.</param>
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45 | /// <param name="parent1">The first parent for crossover.</param>
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46 | /// <param name="parent2">The second parent for crossover.</param>
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47 | /// <returns>The newly created integer vector, resulting from the single point crossover.</returns>
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48 | public static IntegerVector Apply(IRandom random, IntegerVector parent1, IntegerVector parent2) {
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49 | if (parent1.Length != parent2.Length)
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50 | throw new ArgumentException("DiscreteCrossover: The parents are of different length.");
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51 |
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52 | int length = parent1.Length;
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53 | int[] result = new int[length];
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54 | int breakPoint = random.Next(1, length);
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55 |
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56 | for (int i = 0; i < breakPoint; i++)
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57 | result[i] = parent1[i];
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58 | for (int i = breakPoint; i < length; i++)
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59 | result[i] = parent2[i];
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60 |
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61 | return new IntegerVector(result);
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62 | }
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63 |
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64 | /// <summary>
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65 | /// Performs a single point crossover at a randomly chosen position of two
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66 | /// given parent integer vectors.
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67 | /// </summary>
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68 | /// <exception cref="ArgumentException">Thrown if there are not exactly two parents.</exception>
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69 | /// <param name="random">A random number generator.</param>
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70 | /// <param name="parents">An array containing the two integer vectors that should be crossed.</param>
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71 | /// <returns>The newly created integer vector, resulting from the single point crossover.</returns>
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72 | protected override IntegerVector Cross(IRandom random, ItemArray<IntegerVector> parents) {
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73 | if (parents.Length != 2) throw new ArgumentException("ERROR in SinglePointCrossover: The number of parents is not equal to 2");
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74 | return Apply(random, parents[0], parents[1]);
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75 | }
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76 | }
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77 | }
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