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source: trunk/sources/HeuristicLab.Problems.TravelingSalesman/3.3/Analyzers/TSPAlleleFrequencyAnalyzer.cs @ 4866

Last change on this file since 4866 was 4866, checked in by swagner, 13 years ago

Modified TSPAlleleFrequencyAnalyzer to use the distance matrix if available (#1234)

File size: 3.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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 HeuristicLab.Analysis;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Encodings.PermutationEncoding;
28using HeuristicLab.Parameters;
29using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
30
31namespace HeuristicLab.Problems.TravelingSalesman {
32  /// <summary>
33  /// An operator for analyzing the frequency of alleles in solutions of Traveling Salesman Problems given in path representation.
34  /// </summary>
35  [Item("TSPAlleleFrequencyAnalyzer", "An operator for analyzing the frequency of alleles in solutions of Traveling Salesman Problems given in path representation.")]
36  [StorableClass]
37  public sealed class TSPAlleleFrequencyAnalyzer : AlleleFrequencyAnalyzer<Permutation> {
38    public LookupParameter<DoubleMatrix> CoordinatesParameter {
39      get { return (LookupParameter<DoubleMatrix>)Parameters["Coordinates"]; }
40    }
41    public LookupParameter<DistanceMatrix> DistanceMatrixParameter {
42      get { return (LookupParameter<DistanceMatrix>)Parameters["DistanceMatrix"]; }
43    }
44
45    [StorableConstructor]
46    private TSPAlleleFrequencyAnalyzer(bool deserializing) : base(deserializing) { }
47    private TSPAlleleFrequencyAnalyzer(TSPAlleleFrequencyAnalyzer original, Cloner cloner) : base(original, cloner) { }
48    public TSPAlleleFrequencyAnalyzer()
49      : base() {
50      Parameters.Add(new LookupParameter<DoubleMatrix>("Coordinates", "The x- and y-coordinates of the cities."));
51      Parameters.Add(new LookupParameter<DistanceMatrix>("DistanceMatrix", "The matrix which contains the distances between the cities."));
52    }
53
54    public override IDeepCloneable Clone(Cloner cloner) {
55      return new TSPAlleleFrequencyAnalyzer(this, cloner);
56    }
57
58    protected override Allele[] CalculateAlleles(Permutation solution) {
59      Allele[] alleles = new Allele[solution.Length];
60      DoubleMatrix coords = CoordinatesParameter.ActualValue;
61      DistanceMatrix dm = DistanceMatrixParameter.ActualValue;
62      int source, target, h;
63      double impact;
64
65      for (int i = 0; i < solution.Length - 1; i++) {
66        source = solution[i];
67        target = solution[i + 1];
68        if (source > target) { h = source; source = target; target = h; }
69        impact = dm != null ? dm[source, target] : CalculateLength(coords[source, 0], coords[source, 1], coords[target, 0], coords[target, 1]);
70        alleles[i] = new Allele(source.ToString() + "-" + target.ToString(), impact);
71      }
72      source = solution[solution.Length - 1];
73      target = solution[0];
74      if (source > target) { h = source; source = target; target = h; }
75      impact = dm != null ? dm[source, target] : CalculateLength(coords[source, 0], coords[source, 1], coords[target, 0], coords[target, 1]);
76      alleles[alleles.Length - 1] = new Allele(source.ToString() + "-" + target.ToString(), impact);
77
78      return alleles;
79    }
80
81    private double CalculateLength(double x1, double y1, double x2, double y2) {
82      return Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
83    }
84  }
85}
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