source: branches/HeuristicLab.DataImporter/HeuristicLab.DataImporter.Command/ChangeValues/BoxCoxTransformationCommand.cs @ 6133

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using HeuristicLab.DataImporter.Data;
using HeuristicLab.DataImporter.Data.CommandBase;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.DataImporter.Command.View;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.Command {
  [StorableClass]
  [ViewableCommandInfoAttribute("Box-Cox Transformation", 1, ColumnGroupState.DoubleColumnSelected, "Change Values",
  Position = 6, OptionsView = typeof(BoxCoxTransformationCommandView))]
  public class BoxCoxTransformationCommand : ColumnGroupCommandWithAffectedColumnsBase {
    private BoxCoxTransformationCommand()
      : base(null, string.Empty, null) {
    }

    public BoxCoxTransformationCommand(DataSet dataSet, string columnGroupName, int[] affectedColumns)
      : base(dataSet, columnGroupName, affectedColumns) {
    }

    [Storable]
    private double lambda;
    public double Lambda {
      get { return this.lambda; }
      set { this.lambda = value; }
    }
    [Storable]
    private double c;
    public double C {
      get { return this.c; }
      set { this.c = value; }
    }

    public override string Description {
      get { return "Box-Cox Transformation"; }
    }

    public override void Execute() {
      base.Execute();
      DoubleColumn column;
      foreach (int col in AffectedColumns) {
        if (ColumnGroup.GetColumn(col) is DoubleColumn) {
          column = (DoubleColumn)ColumnGroup.GetColumn(col);
          for (int i = 0; i < column.TotalValuesCount; i++)
            if (column.GetValue(i) != null) {
              if (lambda != 0.0) {
                column.ChangeValue(i, Math.Pow((double)column.GetValue(i) + c, lambda) - 1);
              } else {
                column.ChangeValue(i, Math.Log((double)column.GetValue(i) + c));
              }
            }
        }
      }
      ColumnGroup.FireChanged();
      ColumnGroup = null;
    }

    public override void UndoExecute() {
      base.UndoExecute();
      DoubleColumn column;
      foreach (int col in AffectedColumns) {
        if (ColumnGroup.GetColumn(col) is DoubleColumn) {
          column = (DoubleColumn)ColumnGroup.GetColumn(col);
          for (int i = 0; i < column.TotalValuesCount; i++)
            if (column.GetValue(i) != null) {
              if (lambda != 0.0) {
                column.ChangeValue(i, Math.Pow((double)column.GetValue(i) + 1, 1.0 / lambda) - c);
              } else {
                column.ChangeValue(i, Math.Exp((double)column.GetValue(i)) - c);
              }
            }
        }
      }
      ColumnGroup.FireChanged();
      ColumnGroup = null;
    }
  }
}