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source: branches/RBFRegression/HeuristicLab.Algorithms.DataAnalysis/3.4/RadialBasisFunctions/Distances/AngularDistance.cs @ 14386

Last change on this file since 14386 was 14386, checked in by bwerth, 7 years ago

#2699 moved RadialBasisFunctions from Problems.SurrogateProblem to Algorithms.DataAnalysis

File size: 2.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 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 System.Collections.Generic;
24using System.Linq;
25using HeuristicLab.Common;
26using HeuristicLab.Core;
27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
28
29namespace HeuristicLab.Algorithms.DataAnalysis {
30  [StorableClass]
31  [Item("AngularDistance", "The Angluar Distance as defined as a normalized distance measure dependent on the angle between two vectors.\nIt is designed for vectors with all positive coordinates")]
32  public class AngularDistance : DistanceBase<IEnumerable<double>> {
33
34    #region HLConstructors & Boilerplate
35    [StorableConstructor]
36    protected AngularDistance(bool deserializing) : base(deserializing) { }
37    [StorableHook(HookType.AfterDeserialization)]
38    private void AfterDeserialization() { }
39    protected AngularDistance(AngularDistance original, Cloner cloner)
40      : base(original, cloner) { }
41    public AngularDistance() { }
42    public override IDeepCloneable Clone(Cloner cloner) {
43      return new AngularDistance(this, cloner);
44    }
45    #endregion
46
47    #region statics
48    public static double GetDistance(double[] point1, double[] point2) {
49      if (point1.Length != point2.Length) throw new ArgumentException("Angluar distance not defined on vectors of different length");
50      var innerProduct = point1.Zip(point2, (x, y) => x * y).Sum();
51      return Math.Acos(innerProduct / (Norm(point1) * Norm(point2))) / Math.PI;
52    }
53    public static double GetDistance(IEnumerable<double> a, IEnumerable<double> b, double threshold) {
54      return GetDistance(a.ToArray(), b.ToArray());     //no shortcut evaluation for Angular Distance
55    }
56    #endregion
57    public override double Get(IEnumerable<double> a, IEnumerable<double> b) {
58      return GetDistance(a.ToArray(), b.ToArray());
59    }
60    public override double Get(IEnumerable<double> a, IEnumerable<double> b, double threshold) {
61      return GetDistance(a, b, threshold);
62    }
63
64    private static double Norm(IEnumerable<double> point) {
65      return Math.Sqrt(point.Sum(d => d * d));
66    }
67  }
68}
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