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source: trunk/sources/HeuristicLab.GP.StructureIdentification/Division.cs @ 911

Last change on this file since 911 was 656, checked in by gkronber, 16 years ago

merged changesets r644:647 and r651:655 from the GpPluginsRefactoringBranch back into the trunk (#177)

File size: 1.9 KB
RevLine 
[645]1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.Text;
25using HeuristicLab.Core;
26using System.Diagnostics;
27using HeuristicLab.Constraints;
28using System.Linq;
29using HeuristicLab.DataAnalysis;
30
31namespace HeuristicLab.GP.StructureIdentification {
32  public sealed class Division : FunctionBase {
33    private const double EPSILON = 10.0E-20; // if any divisor is < EPSILON return 0
34
35    public override string Description {
36      get {
37        return @"Protected division
38Divides the result of the first sub-tree by the results of the following sub-tree.
39In case one of the divisors is 0 returns 0.
40    (/ 3) => 1/3
41    (/ 2 3) => 2/3
42    (/ 3 4 5) => 3/20
43    (/ 2 0 4) => 0
44";
45      }
46    }
47
48    public Division()
49      : base() {
50      // 2 - 3 seems like an reasonable defaut (used for +,-,*,/) (discussion with swinkler and maffenze)
51      AddConstraint(new NumberOfSubOperatorsConstraint(2, 3));
52      AddConstraint(new SubOperatorTypeConstraint(0));
53      AddConstraint(new SubOperatorTypeConstraint(1));
54      AddConstraint(new SubOperatorTypeConstraint(2));
55    }
56  }
57}
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