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source: branches/3.0/sources/HeuristicLab.Functions/Signum.cs @ 17116

Last change on this file since 17116 was 2, checked in by swagner, 17 years ago

Added HeuristicLab 3.0 sources from former SVN repository at revision 52

File size: 2.0 KB
Line 
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 HeuristicLab.DataAnalysis;
29
30namespace HeuristicLab.Functions {
31  public class Signum : FunctionBase {
32    public override string Description {
33      get { return "Returns the signum of the first sub-operator."; }
34    }
35
36    public Signum()
37      : base() {
38      // must have exactly 1 suboperator
39      AddConstraint(new NumberOfSubOperatorsConstraint(1, 1));
40    }
41
42    public Signum(Signum source, IDictionary<Guid, object> clonedObjects)
43      : base(source, clonedObjects) {
44    }
45
46
47    public override double Evaluate(Dataset dataset, int sampleIndex) {
48      double value = SubFunctions[0].Evaluate(dataset, sampleIndex);
49      if(value < 0) return -1;
50      if(value > 0) return 1;
51      return 0;
52    }
53
54    public override object Clone(IDictionary<Guid, object> clonedObjects) {
55      Signum clone = new Signum(this, clonedObjects);
56      clonedObjects.Add(clone.Guid, clone);
57      return clone;
58    }
59
60
61    public override void Accept(IFunctionVisitor visitor) {
62      visitor.Visit(this);
63    }
64  }
65}
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