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source: branches/3.0/sources/HeuristicLab.TestFunctions/LevyEvaluator.cs @ 15781

Last change on this file since 15781 was 292, checked in by swagner, 16 years ago

Merged fix of ticket #135 (r290:291) from trunk into 3.0 release branch

File size: 1.8 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  public class LevyEvaluator : TestFunctionEvaluatorBase {
28    public override string Description {
29      get { return
30@"Levy Function
31
32Domain:  [-10.0 , 10.0]^n
33Optimum: 0.0 at (1.0, 1.0, ..., 1.0)";
34          }
35    }
36
37    public static double Apply(double[] point) {
38      int length = point.Length;
39      double[] z = new double[length];
40      double s;
41
42      for (int i = 0; i < length; i++) {
43        z[i] = 1 + (point[i] - 1) / 4;
44      }
45
46      s = Math.Pow(Math.Sin(Math.PI * z[1]), 2);
47
48      for (int i = 0; i < length - 1; i++) {
49        s += Math.Pow(z[i] - 1, 2) * (1 + 10 * Math.Pow(Math.Sin(Math.PI * z[i] + 1), 2));
50      }
51
52      return s + Math.Pow(z[length - 1] - 1, 2) * (1 + Math.Pow(Math.Sin(2 * Math.PI * z[length - 1]), 2));
53    }
54
55    protected override double EvaluateFunction(double[] point) {
56      return Apply(point);
57    }
58  }
59}
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