Free cookie consent management tool by TermsFeed Policy Generator

source: branches/CEDMA-Exporter-715/sources/HeuristicLab.DataAnalysis/3.3/DatasetShuffler.cs @ 3701

Last change on this file since 3701 was 1529, checked in by gkronber, 16 years ago

Moved source files of plugins AdvancedOptimizationFrontEnd ... Grid into version-specific sub-folders. #576

File size: 2.1 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.Linq;
25using System.Text;
26using HeuristicLab.Core;
27using HeuristicLab.Data;
28using HeuristicLab.Random;
29
30namespace HeuristicLab.DataAnalysis {
31  public class DatasetShuffler : OperatorBase {
32    public DatasetShuffler()
33      : base() {
34      AddVariableInfo(new VariableInfo("Dataset", "Dataset which should be shuffled (random row order)", typeof(Dataset), VariableKind.In | VariableKind.Out));
35      AddVariableInfo(new VariableInfo("Random", "Randomizer", typeof(MersenneTwister), VariableKind.In));
36    }
37
38    public override IOperation Apply(IScope scope) {
39      Dataset dataset = GetVariableValue<Dataset>("Dataset", scope, true);
40      MersenneTwister tw = GetVariableValue<MersenneTwister>("Random", scope, true);
41
42      for(int i = 0; i < dataset.Rows - 1; i++) {
43        int j = tw.Next(i, dataset.Rows);
44        ExchangeRows(dataset, i, j);
45      }
46
47      return null;
48    }
49
50    private void ExchangeRows(Dataset dataset, int i, int j) {
51      for(int k = 0; k < dataset.Columns; k++) {
52        double temp = dataset.GetValue(i, k);
53        dataset.SetValue(i, k, dataset.GetValue(j, k));
54        dataset.SetValue(j, k, temp);
55      }
56    }
57  }
58}
Note: See TracBrowser for help on using the repository browser.