[2900] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2008 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.Core;
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| 26 |
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| 27 | namespace HeuristicLab.Encodings.RealVector {
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| 28 | /// <summary>
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| 29 | /// Single point crossover for real vectors.
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| 30 | /// </summary>
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| 31 | public class SinglePointCrossover : RealVectorCrossoverBase {
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| 32 | /// <inheritdoc select="summary"/>
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| 33 | public override string Description {
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| 34 | get { return "Single point crossover for real vectors."; }
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| 35 | }
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| 36 |
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| 37 | /// <summary>
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| 38 | /// Performs a single point crossover at a randomly chosen position of the two
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| 39 | /// given parent real vectors.
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| 40 | /// </summary>
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| 41 | /// <param name="random">A random number generator.</param>
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| 42 | /// <param name="parent1">The first parent for crossover.</param>
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| 43 | /// <param name="parent2">The second parent for crossover.</param>
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| 44 | /// <returns>The newly created real vector, resulting from the single point crossover.</returns>
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| 45 | public static double[] Apply(IRandom random, double[] parent1, double[] parent2) {
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| 46 | int length = parent1.Length;
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| 47 | double[] result = new double[length];
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| 48 | int breakPoint = random.Next(1, length);
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| 49 |
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| 50 | for (int i = 0; i < breakPoint; i++)
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| 51 | result[i] = parent1[i];
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| 52 | for (int i = breakPoint; i < length; i++)
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| 53 | result[i] = parent2[i];
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| 54 |
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| 55 | return result;
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| 56 | }
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| 57 |
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| 58 | /// <summary>
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| 59 | /// Performs a single point crossover operation for two given parent real vectors.
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| 60 | /// </summary>
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| 61 | /// <exception cref="InvalidOperationException">Thrown if there are not exactly two parents.</exception>
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| 62 | /// <param name="scope">The current scope.</param>
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| 63 | /// <param name="random">A random number generator.</param>
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| 64 | /// <param name="parents">An array containing the two real vectors that should be crossed.</param>
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| 65 | /// <returns>The newly created real vector, resulting from the crossover operation.</returns>
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| 66 | protected override double[] Cross(IScope scope, IRandom random, double[][] parents) {
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| 67 | if (parents.Length != 2) throw new InvalidOperationException("ERROR in SinglePointCrossover: The number of parents is not equal to 2");
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| 68 | return Apply(random, parents[0], parents[1]);
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| 69 | }
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| 70 | }
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| 71 | }
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