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source: trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/GeneralSymbolicExpressionTreeEvaluator.cs @ 3256

Last change on this file since 3256 was 3256, checked in by gkronber, 13 years ago

Moved general set of symbols and evaluator into Encodings.SymbolicExpressionTreeEncoding. #937 (Data types and operators for symbolic expression tree encoding)

File size: 2.2 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.Persistence.Default.CompositeSerializers.Storable;
24using HeuristicLab.Core;
25using System.Collections.Generic;
26using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
27using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.GeneralSymbols;
28
29namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
30  /// <summary>
31  /// Evaluates FunctionTrees recursively by interpretation of the function symbols in each node.
32  /// Simple unoptimized code, general symbolic expressions only.
33  /// Not thread-safe!
34  /// </summary>
35  [StorableClass]
36  [Item("GeneralSymbolicExpressionTreeEvaluator", "Default evaluator for symbolic expression trees.")]
37  public class GeneralSymbolicExpressionTreeEvaluator : Item {
38    public virtual double Evaluate(SymbolicExpressionTreeNode node) {
39      if (node.Symbol is Addition) {
40        return Evaluate(node.SubTrees[0]) + Evaluate(node.SubTrees[1]);
41      } else if (node.Symbol is Subtraction) {
42        return Evaluate(node.SubTrees[0]) - Evaluate(node.SubTrees[1]);
43      } else if (node.Symbol is Multiplication) {
44        return Evaluate(node.SubTrees[0]) * Evaluate(node.SubTrees[1]);
45      } else if (node.Symbol is Division) {
46        return Evaluate(node.SubTrees[0]) / Evaluate(node.SubTrees[1]);
47      } else {
48        throw new NotSupportedException("Tree contains unknown symbol: " + node.Symbol.Name);
49      }
50    }
51  }
52}
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