1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022019 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  using System;


22  using HeuristicLab.Common;


23  using HeuristicLab.Core;


24  using HeuristicLab.Encodings.RealVectorEncoding;


25  using HEAL.Fossil;


26 


27  namespace HeuristicLab.Problems.TestFunctions.MultiObjective {


28  [Item("ZDT4", "ZDT4 function as defined in http://www.tik.ee.ethz.ch/sop/download/supplementary/testproblems/ [30.11.2015]")]


29  [StorableType("489FC6F2A4614A0AA5D2145598A43283")]


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(StorableConstructorFlag _) : base(_) { }


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  }

