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source: branches/3026_IntegrationIntoSymSpace/HeuristicLab.Optimization.Operators/3.3/QuadraticDiscreteDoubleValueModifier.cs @ 17928

Last change on this file since 17928 was 17928, checked in by dpiringe, 3 years ago

#3026

  • merged trunk into branch
File size: 2.9 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HEAL.Attic;
25
26namespace HeuristicLab.Optimization.Operators {
27  /// <summary>
28  /// Modifies the value by quadratic fall (slow fall initially, fast fall to the end) or rise (slow rise initally, fast rise to the end).
29  /// </summary>
30  [Item("QuadraticDiscreteDoubleValueModifier", "Modifies the value by quadratic fall (slow fall initially, fast fall to the end) or rise (slow rise initally, fast rise to the end).")]
31  [StorableType("49CADD22-7074-4ADB-AA7B-36D03115FB1A")]
32  public class QuadraticDiscreteDoubleValueModifier : DiscreteDoubleValueModifier {
33    [StorableConstructor]
34    protected QuadraticDiscreteDoubleValueModifier(StorableConstructorFlag _) : base(_) { }
35    protected QuadraticDiscreteDoubleValueModifier(QuadraticDiscreteDoubleValueModifier original, Cloner cloner) : base(original, cloner) { }
36    public QuadraticDiscreteDoubleValueModifier() : base() { }
37
38    public override IDeepCloneable Clone(Cloner cloner) {
39      return new QuadraticDiscreteDoubleValueModifier(this, cloner);
40    }
41
42    protected override double Modify(double value, double startValue, double endValue, int index, int startIndex, int endIndex) {
43      return Apply(value, startValue, endValue, index, startIndex, endIndex);
44    }
45
46    /// <summary>
47    /// Calculates a new value based on quadratic decay or growth.
48    /// </summary>
49    /// <param name="value">The previous value.</param>
50    /// <param name="startValue">The initial value.</param>
51    /// <param name="endValue">The final value.</param>
52    /// <param name="index">The current index.</param>
53    /// <param name="startIndex">The initial index.</param>
54    /// <param name="endIndex">The final index.</param>
55    /// <returns>The new value.</returns>
56    public static double Apply(double value, double startValue, double endValue, int index, int startIndex, int endIndex) {
57      double a = (endValue - startValue) / ((endIndex - startIndex) * (endIndex - startIndex));
58      return a * (index - startIndex) * (index - startIndex) + startValue;
59    }
60  }
61}
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