1 | using System;
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2 | using System.Collections.Generic;
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3 | using HeuristicLab.Common;
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4 | using HeuristicLab.Core;
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5 | using HeuristicLab.Data;
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6 | using HeuristicLab.Encodings.RealVectorEncoding;
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7 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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8 |
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9 | namespace HeuristicLab.Problems.MultiObjectiveTestFunctions {
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10 | [Item("SchafferN2", "Schaffer function N.2 for mulitobjective optimization from // https://en.wikipedia.org/wiki/Test_functions_for_optimization [30.11.2015]")]
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11 | [StorableClass]
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12 | public class SchafferN2 : MultiObjectiveTestFunction {
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13 |
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14 | public override double[,] Bounds(int objectives) {
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15 | return new double[,] { { -5, 10 } };
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16 | }
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17 |
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18 | public override bool[] Maximization(int objecitves) {
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19 | return new bool[2];
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20 | }
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21 |
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22 | public override int MinimumSolutionLength {
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23 | get { return 1; }
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24 | }
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25 |
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26 | public override int MaximumSolutionLength {
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27 | get { return 1; }
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28 | }
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29 |
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30 | public override int MinimumObjectives {
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31 | get { return 2; }
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32 | }
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33 |
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34 | public override int MaximumObjectives {
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35 | get { return 2; }
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36 | }
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37 |
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38 | public override double[] ReferencePoint(int objecitves) {
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39 | return new double[] { 100, 100 };
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40 | }
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41 |
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42 |
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43 | public override IEnumerable<double[]> OptimalParetoFront(int objectives) {
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44 | throw new NotImplementedException();
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45 | }
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46 |
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47 | [StorableConstructor]
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48 | protected SchafferN2(bool deserializing) : base(deserializing) { }
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49 | protected SchafferN2(SchafferN2 original, Cloner cloner) : base(original, cloner) { }
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50 | public override IDeepCloneable Clone(Cloner cloner) {
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51 | return new SchafferN2(this, cloner);
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52 | }
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53 |
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54 | public SchafferN2() : base() { }
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55 |
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56 |
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57 |
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58 |
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59 |
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60 | public override double[] Evaluate(RealVector r, int objectives) {
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61 | if (objectives != 2) throw new ArgumentException("The Schaffer N1 problem must always have 2 objectives");
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62 | double x = r[0];
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63 |
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64 | //objective1
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65 | double f0;
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66 | if (x <= 1) f0 = -x;
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67 | else if (x <= 3) f0 = x - 2;
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68 | else if (x <= 4) f0 = 4 - x;
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69 | else f0 = x - 4;
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70 |
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71 | //objective0
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72 | double f1 = x - 5;
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73 | f1 *= f1;
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74 |
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75 | return new double[] { f0, f1 };
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76 | }
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77 | }
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78 | }
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