1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 | using System;
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22 | using System.Collections.Generic;
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23 | using HeuristicLab.Common;
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24 |
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25 | namespace HeuristicLab.Problems.MultiObjectiveTestFunctions {
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26 |
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27 | /// <summary>
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28 | /// Spacing is defined as the standarddeviation of all d[i]
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29 | /// where d[i] is the minimum eukildean distance any point has
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30 | /// to all OTHER points in the same front
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31 | /// </summary>
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32 | public class Spacing {
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33 |
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34 | public static double Calculate(IEnumerable<double[]> front) {
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35 | if (front == null) throw new ArgumentException("Fronts must not be null");
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36 | List<double> d = new List<double>();
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37 | foreach (double[] r in front) {
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38 | double dist = Utilities.minDistance(r, front, false);
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39 | d.Add(dist >= 0 ? dist : 0);
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40 | }
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41 | int n = d.Count;
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42 | if (n == 0) throw new ArgumentException("Fronts must not be empty");
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43 | return Math.Sqrt(d.Variance() * (n - 1) / n);
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44 |
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45 | }
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46 |
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47 | }
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48 | }
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