[2900] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[2913] | 3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[2900] | 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 HeuristicLab.Core;
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| 24 | using HeuristicLab.Data;
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[2913] | 25 | using HeuristicLab.Parameters;
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| 26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[2900] | 27 |
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| 28 | namespace HeuristicLab.Encodings.RealVector {
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| 29 | /// <summary>
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[2913] | 30 | /// Uniformly distributed change of a single position in a real vector.
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[2900] | 31 | /// </summary>
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[2913] | 32 | /// <remarks>
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| 33 | /// 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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| 34 | /// </remarks>
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| 35 | [Item("UniformOnePositionManipulator", "Changes a single position in the vector by sampling uniformly from the interval [Minimum, Maximum). 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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[3017] | 36 | [StorableClass]
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[2913] | 37 | public class UniformOnePositionManipulator : RealVectorManipulator {
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[2921] | 38 | /// <summary>
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| 39 | /// The lower bound of the values in the real vector.
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| 40 | /// </summary>
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[3048] | 41 | public ValueLookupParameter<DoubleValue> MinimumParameter {
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| 42 | get { return (ValueLookupParameter<DoubleValue>)Parameters["Minimum"]; }
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[2900] | 43 | }
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[2921] | 44 | /// <summary>
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| 45 | /// The upper bound of the values in the real vector.
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| 46 | /// </summary>
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[3048] | 47 | public ValueLookupParameter<DoubleValue> MaximumParameter {
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| 48 | get { return (ValueLookupParameter<DoubleValue>)Parameters["Maximum"]; }
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[2913] | 49 | }
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| 50 |
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[2900] | 51 | /// <summary>
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[2913] | 52 | /// Initializes a new instance of <see cref="UniformOnePositionManipulator"/> with two parameters
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[2900] | 53 | /// (<c>Minimum</c> and <c>Maximum</c>).
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| 54 | /// </summary>
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| 55 | public UniformOnePositionManipulator() {
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[3048] | 56 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Minimum", "Minimum of the sampling range for the vector element (included)"));
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| 57 | Parameters.Add(new ValueLookupParameter<DoubleValue>("Maximum", "Maximum of the sampling range for the vector element (excluded)"));
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[2900] | 58 | }
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| 59 |
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| 60 | /// <summary>
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| 61 | /// Changes randomly a single position in the given real <paramref name="vector"/>.
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| 62 | /// </summary>
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| 63 | /// <param name="random">A random number generator.</param>
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| 64 | /// <param name="vector">The real vector to manipulate.</param>
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| 65 | /// <param name="min">The minimum value of the sampling range for
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| 66 | /// the vector element to change (inclusive).</param>
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| 67 | /// <param name="max">The maximum value of the sampling range for
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| 68 | /// the vector element to change (exclusive).</param>
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[3048] | 69 | public static void Apply(IRandom random, DoubleArray vector, DoubleValue min, DoubleValue max) {
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[2913] | 70 | int index = random.Next(vector.Length);
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| 71 | vector[index] = min.Value + random.NextDouble() * (max.Value - min.Value);
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[2900] | 72 | }
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| 73 |
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| 74 | /// <summary>
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[3048] | 75 | /// Checks if the minimum and maximum parameters are available and forwards the call to <see cref="Apply(IRandom, DoubleArray, DoubleValue, DoubleValue)"/>.
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[2900] | 76 | /// </summary>
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[2913] | 77 | /// <param name="random">The random number generator to use.</param>
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| 78 | /// <param name="realVector">The real vector to manipulate.</param>
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[3048] | 79 | protected override void Manipulate(IRandom random, DoubleArray realVector) {
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[2913] | 80 | if (MinimumParameter.ActualValue == null) throw new InvalidOperationException("UniformOnePositionManipulator: Parameter " + MinimumParameter.ActualName + " could not be found.");
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| 81 | if (MaximumParameter.ActualValue == null) throw new InvalidOperationException("UniformOnePositionManipulator: Parameter " + MaximumParameter.ActualName + " could not be found.");
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| 82 | Apply(random, realVector, MinimumParameter.ActualValue, MaximumParameter.ActualValue);
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[2900] | 83 | }
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| 84 | }
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| 85 | }
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