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source: trunk/sources/HeuristicLab.BitVector/3.2/RandomBitVectorGenerator.cs @ 2864

Last change on this file since 2864 was 2784, checked in by gkronber, 15 years ago

Fixed bug in random initialization of bit-vectors. #869 (UniformCrossover for Bitvectors)

File size: 3.1 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 HeuristicLab.Data;
27
28namespace HeuristicLab.BitVector {
29  /// <summary>
30  /// Generates a new random bit vector.
31  /// </summary>
32  public class RandomBitVectorGenerator : OperatorBase {
33    /// <inheritdoc select="summary"/>
34    public override string Description {
35      get { return "Operator generating a new random bit vector."; }
36    }
37
38    /// <summary>
39    /// Initializes a new instance of <see cref="RandomBitVectorGenerator"/> with three variable infos
40    /// (<c>Random</c>, <c>Length</c> and <c>BitVector</c>).
41    /// </summary>
42    public RandomBitVectorGenerator() {
43      AddVariableInfo(new VariableInfo("Random", "Pseudo random number generator", typeof(IRandom), VariableKind.In));
44      AddVariableInfo(new VariableInfo("Length", "Vector length", typeof(IntData), VariableKind.In));
45      AddVariableInfo(new VariableInfo("BitVector", "Created random bit vector", typeof(BoolArrayData), VariableKind.New));
46    }
47
48    /// <summary>
49    /// Generates a new random bit vector with the given <paramref name="length"/>.
50    /// </summary>
51    /// <param name="random">The random number generator.</param>
52    /// <param name="length">The length of the bit vector.</param>
53    /// <returns>The newly created bit vector.</returns>
54    public static bool[] Apply(IRandom random, int length) {
55      bool[] result = new bool[length];
56      for (int i = 0; i < length; i++)
57        result[i] = random.NextDouble() < 0.5;
58      return result;
59    }
60
61    /// <summary>
62    /// Generates a new random bit vector and injects it in the given <paramref name="scope"/>.
63    /// </summary>
64    /// <param name="scope">The scope where to get the values from and where to inject the newly
65    /// created bit vector.</param>
66    /// <returns><c>null</c>.</returns>
67    public override IOperation Apply(IScope scope) {
68      IRandom random = GetVariableValue<IRandom>("Random", scope, true);
69      int length = GetVariableValue<IntData>("Length", scope, true).Data;
70
71      bool[] vector = Apply(random, length);
72      scope.AddVariable(new Variable(scope.TranslateName("BitVector"), new BoolArrayData(vector)));
73
74      return null;
75    }
76  }
77}
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