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source: branches/HeuristicLab.Hive_Milestone2/sources/HeuristicLab.TestFunctions/3.2/LevyEvaluator.cs @ 4900

Last change on this file since 4900 was 1530, checked in by gkronber, 16 years ago

Moved source files of plugins Hive ... Visualization.Test into version-specific sub-folders. #576

File size: 2.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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 System;
23using System.Collections.Generic;
24using System.Text;
25
26namespace HeuristicLab.TestFunctions {
27  /// <summary>
28  /// Levy Function<br/>
29  /// Domain:  [-10.0 , 10.0]^n<br/>
30  /// Optimum: 0.0 at (1.0, 1.0, ..., 1.0)
31  /// </summary>
32  public class LevyEvaluator : TestFunctionEvaluatorBase {
33    /// <inheritdoc select="summary"/>
34    public override string Description {
35      get { return
36@"Levy Function
37
38Domain:  [-10.0 , 10.0]^n
39Optimum: 0.0 at (1.0, 1.0, ..., 1.0)";
40          }
41    }
42
43    /// <summary>
44    /// Evaluates the test function for a specific <paramref name="point"/>.
45    /// </summary>
46    /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
47    /// <returns>The result value of the Levy function at the given point.</returns>
48    public static double Apply(double[] point) {
49      int length = point.Length;
50      double[] z = new double[length];
51      double s;
52
53      for (int i = 0; i < length; i++) {
54        z[i] = 1 + (point[i] - 1) / 4;
55      }
56
57      s = Math.Pow(Math.Sin(Math.PI * z[1]), 2);
58
59      for (int i = 0; i < length - 1; i++) {
60        s += Math.Pow(z[i] - 1, 2) * (1 + 10 * Math.Pow(Math.Sin(Math.PI * z[i] + 1), 2));
61      }
62
63      return s + Math.Pow(z[length - 1] - 1, 2) * (1 + Math.Pow(Math.Sin(2 * Math.PI * z[length - 1]), 2));
64    }
65
66    /// <summary>
67    /// Evaluates the test function for a specific <paramref name="point"/>.
68    /// </summary>
69    /// <remarks>Calls <see cref="Apply"/>.</remarks>
70    /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
71    /// <returns>The result value of the Levy function at the given point.</returns>
72    protected override double EvaluateFunction(double[] point) {
73      return Apply(point);
74    }
75  }
76}
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