# source:branches/2520_PersistenceReintegration/HeuristicLab.Problems.TestFunctions.MultiObjective/3.3/TestFunctions/ZDT/ZDT4.cs@16453

Last change on this file since 16453 was 16453, checked in by jkarder, 2 years ago

File size: 2.3 KB
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2/* HeuristicLab
3 * Copyright (C) 2002-2019 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
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
21using System;
22using HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Encodings.RealVectorEncoding;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Problems.TestFunctions.MultiObjective {
29  [StorableClass]
30  public class ZDT4 : ZDT {
31    protected override double[,] GetBounds(int objectives) {
32      double[,] bounds = new double[objectives, 2];
33      bounds[0, 0] = 0; bounds[0, 1] = 1;
34      for (int i = 1; i < objectives; i++) {
35        bounds[i, 0] = -5;
36        bounds[i, 1] = 5;
37      }
38      return bounds;
39    }
40
41    protected override double GetBestKnownHypervolume(int objectives) {
42      return 120 + 2.0 / 3;
43    }
44
45    [StorableConstructor]
46    protected ZDT4(bool deserializing) : base(deserializing) { }
47    protected ZDT4(ZDT4 original, Cloner cloner) : base(original, cloner) { }
48    public override IDeepCloneable Clone(Cloner cloner) {
49      return new ZDT4(this, cloner);
50    }
51    public ZDT4() : base() { }
52
53    public override double[] Evaluate(RealVector r) {
54      double g = 0;
55      for (int i = 1; i < r.Length; i++) {
56        double v = r[i];
57        g += v * v - 10 * Math.Cos(4 * Math.PI * v);
58      }
59      g = 1.0 + 10.0 * (r.Length - 1) + g;
60      double d = r[0] / g;
61      double f0 = r[0];
62      double f1 = 1 - Math.Sqrt(d);
63      return new double[] { f0, f1 };
64    }
65  }
66}
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