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source: trunk/sources/HeuristicLab.Problems.DataAnalysis/3.3/Symbolic/Symbols/VariableTreeNode.cs @ 4239

Last change on this file since 4239 was 4239, checked in by gkronber, 14 years ago

Merged improvements of symbolic simplifier (revisions: r4220, r4226, r4235:4238) back into trunk. #1026

File size: 2.9 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 HeuristicLab.Core;
23using HeuristicLab.Common;
24using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26using HeuristicLab.Random;
27namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Symbols {
28  [StorableClass]
29  public class VariableTreeNode : SymbolicExpressionTreeTerminalNode {
30    public new Variable Symbol {
31      get { return (Variable)base.Symbol; }
32    }
33    [Storable]
34    private double weight;
35    public double Weight {
36      get { return weight; }
37      set { weight = value; }
38    }
39    [Storable]
40    private string variableName;
41    public string VariableName {
42      get { return variableName; }
43      set { variableName = value; }
44    }
45
46
47    protected VariableTreeNode() { }
48
49    // copy constructor
50    protected VariableTreeNode(VariableTreeNode original)
51      : base(original) {
52      weight = original.weight;
53      variableName = original.variableName;
54    }
55
56    public VariableTreeNode(Variable variableSymbol) : base(variableSymbol) { }
57
58    public override bool HasLocalParameters {
59      get {
60        return true;
61      }
62    }
63
64    public override void ResetLocalParameters(IRandom random) {
65      base.ResetLocalParameters(random);
66      weight = NormalDistributedRandom.NextDouble(random, Symbol.WeightNu, Symbol.WeightSigma);
67      variableName = Symbol.VariableNames.SelectRandom(random);
68    }
69
70    public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
71      base.ShakeLocalParameters(random, shakingFactor);
72      double x = NormalDistributedRandom.NextDouble(random, Symbol.WeightManipulatorNu, Symbol.WeightManipulatorSigma);
73      weight = weight + x * shakingFactor;
74      variableName = Symbol.VariableNames.SelectRandom(random);
75    }
76
77
78    public override object Clone() {
79      return new VariableTreeNode(this);
80    }
81
82    public override string ToString() {
83      if (weight.IsAlmost(1.0)) return variableName;
84      else return weight.ToString("E4") + " " + variableName;
85    }
86  }
87}
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