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source: branches/3.1/sources/HeuristicLab.TestFunctions/AckleyEvaluator.cs @ 12977

Last change on this file since 12977 was 107, checked in by swagner, 17 years ago

Fixed ticket #87

  • used a static method Apply in each test function evaluation operator
File size: 1.9 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;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Operators;
28
29namespace HeuristicLab.TestFunctions {
30  public class AckleyEvaluator : TestFunctionEvaluatorBase {
31    public override string Description {
32      get { return
33@"Ackley Function
34
35Domain:  [-32.768 , 32.768]^n
36Optimum: 0.0 at (0, 0, ..., 0)";
37          }
38    }
39
40    public static double Apply(double[] point) {
41      double result = 20 + Math.E;
42      double val;
43
44      val = 0;
45      for (int i = 0; i < point.Length; i++)
46        val += point[i] * point[i];
47      val *= 1.0 / point.Length;
48      val = Math.Sqrt(val);
49      val *= -0.2;
50      result -= 20 * Math.Exp(val);
51
52      val = 0;
53      for (int i = 0; i < point.Length; i++)
54        val += Math.Cos(2 * Math.PI * point[i]);
55      val *= 1.0 / point.Length;
56      result -= Math.Exp(val);
57      return (result);
58    }
59
60    protected override double EvaluateFunction(double[] point) {
61      return Apply(point);
62    }
63  }
64}
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