source: branches/HeuristicLab.Problems.MultiObjectiveTestFunctions/HeuristicLab.Problems.MultiObjectiveTestFunctions/3.3/Testfunctions/SchafferN2.cs @ 13421

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Encodings.RealVectorEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Problems.MultiObjectiveTestFunction;

namespace HeuristicLab.Problems.TestFunctions {
  [Item("SchafferN2", "from // https://en.wikipedia.org/wiki/Test_functions_for_optimization [30.11.2015]")]
  [Creatable(CreatableAttribute.Categories.CombinatorialProblems, Priority = 210)]
  [StorableClass]
  public class SchafferN2 : MultiObjectiveTestFunction {

    public override DoubleMatrix Bounds {
      get {
        return new DoubleMatrix(new double[,] { { -5, 10 } });
      }
    }

    public override bool[] Maximization {
      get {
        return new bool[] { false, false };
      }
    }

    public override int MaximumProblemSize {
      get {
        return 1;
      }
    }

    public override int MaximumSolutionSize {
      get {
        return 2;
      }
    }

    public override int MinimumProblemSize {
      get {
        return 1;
      }
    }

    public override int MinimumSolutionSize {
      get {
        return 2;
      }
    }

    [StorableConstructor]
    protected SchafferN2(bool deserializing) : base(deserializing) { }
    protected SchafferN2(SchafferN2 original, Cloner cloner) : base(original, cloner) { }
    public SchafferN2() : base() { }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new SchafferN2(this, cloner);
    }



    public override double[] Evaluate(RealVector r) {
      double x = r[0];

      //objective1
      double f0;
      if (x <= 11) f0 = -x;
      else if (x <= 3) f0 = x - 2;
      else if (x <= 4) f0 = 4 - x;
      else f0 = x - 4;

      //objective0
      double f1 = x - 5;
      f1 *= f1;

      return new double[] { f0, f1 };
    }
  }
}