[2] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[2854] | 3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[2] | 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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[3376] | 22 | using HeuristicLab.Common;
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[2] | 23 | using HeuristicLab.Core;
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[2854] | 24 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[2] | 25 |
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[3053] | 26 | namespace HeuristicLab.Encodings.PermutationEncoding {
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[850] | 27 | /// <summary>
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| 28 | /// Manipulates a permutation array by moving randomly one element to another position in the array.
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[2854] | 29 | /// </summary>
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| 30 | /// <remarks>
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[2871] | 31 | /// It is implemented as described in Fogel, D.B. (1988). An Evolutionary Approach to the Traveling Salesman Problem, Biological Cybernetics, 60, pp. 139-144.
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[2854] | 32 | /// </remarks>
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[3340] | 33 | [Item("InsertionManipulator", "An operator which moves randomly one element to another position in the permutation (Insertion is a special case of Translocation). It is implemented as described in Fogel, D.B. (1988). An Evolutionary Approach to the Traveling Salesman Problem, Biological Cybernetics, 60, pp. 139-144.")]
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[3017] | 34 | [StorableClass]
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[2854] | 35 | public class InsertionManipulator : PermutationManipulator {
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[850] | 36 | /// <summary>
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| 37 | /// Moves an randomly chosen element in the specified <paramref name="permutation"/> array
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| 38 | /// to another randomly generated position.
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| 39 | /// </summary>
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| 40 | /// <param name="random">The random number generator.</param>
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[2854] | 41 | /// <param name="permutation">The permutation to manipulate.</param>
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| 42 | public static void Apply(IRandom random, Permutation permutation) {
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| 43 | Permutation original = (Permutation)permutation.Clone();
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[2] | 44 | int cutIndex, insertIndex, number;
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| 45 |
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[2854] | 46 | cutIndex = random.Next(original.Length);
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| 47 | insertIndex = random.Next(original.Length);
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| 48 | number = original[cutIndex];
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[2] | 49 |
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| 50 | int i = 0; // index in new permutation
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| 51 | int j = 0; // index in old permutation
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[2854] | 52 | while (i < original.Length) {
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[2] | 53 | if (j == cutIndex) {
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| 54 | j++;
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| 55 | }
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| 56 | if (i == insertIndex) {
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[2854] | 57 | permutation[i] = number;
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[2] | 58 | i++;
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| 59 | }
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[2854] | 60 | if ((i < original.Length) && (j < original.Length)) {
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| 61 | permutation[i] = original[j];
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[2] | 62 | i++;
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| 63 | j++;
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| 64 | }
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| 65 | }
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| 66 | }
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| 67 |
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[850] | 68 | /// <summary>
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| 69 | /// Moves an randomly chosen element in the specified <paramref name="permutation"/> array
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| 70 | /// to another randomly generated position.
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| 71 | /// </summary>
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| 72 | /// <remarks>Calls <see cref="Apply"/>.</remarks>
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[2854] | 73 | /// <param name="random">A random number generator.</param>
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| 74 | /// <param name="permutation">The permutation to manipulate.</param>
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| 75 | protected override void Manipulate(IRandom random, Permutation permutation) {
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| 76 | Apply(random, permutation);
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[2] | 77 | }
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| 78 | }
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| 79 | }
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