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source: trunk/sources/HeuristicLab.TestFunctions/3.3/RosenbrockEvaluator.cs @ 3007

Last change on this file since 3007 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: 2.5 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  /// <summary>
31  /// Rosenbrock Function<br/>
32  /// Domain:  [-2.048 , 2.048]^n<br/>
33  /// Optimum: 0.0 at (1, 1, ..., 1)
34  /// </summary>
35  public class RosenbrockEvaluator : TestFunctionEvaluatorBase {
36    /// <inheritdoc select="summary"/>
37    public override string Description {
38      get { return
39@"Rosenbrock Function
40
41Domain:  [-2.048 , 2.048]^n
42Optimum: 0.0 at (1, 1, ..., 1)";
43          }
44    }
45
46    /// <summary>
47    /// Evaluates the test function for a specific <paramref name="point"/>.
48    /// </summary>
49    /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
50    /// <returns>The result value of the Rosenbrock function at the given point.</returns>
51    public static double Apply(double[] point) {
52      double result = 0;
53      for (int i = 0; i < point.Length - 1; i++) {
54        result += 100 * (point[i + 1] - point[i] * point[i]) * (point[i + 1] - point[i] * point[i]);
55        result += (1 - point[i]) * (1 - point[i]);
56      }
57      return result;
58    }
59
60    /// <summary>
61    /// Evaluates the test function for a specific <paramref name="point"/>.
62    /// </summary>
63    /// <remarks>Calls <see cref="Apply"/>.</remarks>
64    /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
65    /// <returns>The result value of the Rosenbrock function at the given point.</returns>
66    protected override double EvaluateFunction(double[] point) {
67      return Apply(point);
68    }
69  }
70}
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