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Ignore:
Timestamp:
10/25/17 12:38:12 (7 years ago)
Author:
pfleck
Message:

#2809: Removed experimental static-typed datacolumns. (reverse merge g15291, r15309)

Location:
branches/DataPreprocessing Cleanup/HeuristicLab.DataPreprocessing/3.4/Data
Files:
1 deleted
3 edited

Legend:

Unmodified
Added
Removed
  • branches/DataPreprocessing Cleanup/HeuristicLab.DataPreprocessing/3.4/Data/FilteredPreprocessingData.cs

    r15309 r15431  
    3838    private IPreprocessingData filteredData;
    3939
    40     public IList<PreprocessingDataColumn> DataColumns {
    41       get { return ActiveData.DataColumns; }
    42     }
    43 
    4440    public IPreprocessingData ActiveData {
    4541      get { return IsFiltered ? filteredData : originalData; }
     
    8682    }
    8783
    88     public IEnumerable<T> GetValues<T>(int columnIndex, bool considerSelection) {
     84    public IList<T> GetValues<T>(int columnIndex, bool considerSelection) {
    8985      return ActiveData.GetValues<T>(columnIndex, considerSelection);
    9086    }
    9187
    92     public void SetValues<T>(int columnIndex, IEnumerable<T> values) {
     88    public void SetValues<T>(int columnIndex, IList<T> values) {
    9389      if (IsFiltered)
    9490        throw new InvalidOperationException("SetValues not possible while data is filtered");
     
    127123    }
    128124
    129     public void DeleteRows(IEnumerable<int> rows) {
     125    public void DeleteRowsWithIndices(IEnumerable<int> rows) {
    130126      if (IsFiltered)
    131127        throw new InvalidOperationException("DeleteRowsWithIndices not possible while data is filtered");
    132128
    133       originalData.DeleteRows(rows);
     129      originalData.DeleteRowsWithIndices(rows);
    134130    }
    135131
     
    277273    public void EndTransaction() {
    278274      originalData.EndTransaction();
     275    }
     276    #endregion
     277
     278    #region Statistics
     279    public T GetMin<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     280      return ActiveData.GetMin<T>(columnIndex, considerSelection, emptyValue);
     281    }
     282    public T GetMax<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     283      return ActiveData.GetMax<T>(columnIndex, considerSelection, emptyValue);
     284    }
     285    public T GetMean<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     286      return ActiveData.GetMean<T>(columnIndex, considerSelection, emptyValue);
     287    }
     288    public T GetMedian<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
     289      return ActiveData.GetMean<T>(columnIndex, considerSelection, emptyValue);
     290    }
     291    public T GetMode<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IEquatable<T> {
     292      return ActiveData.GetMode<T>(columnIndex, considerSelection, emptyValue);
     293    }
     294    public T GetStandardDeviation<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     295      return ActiveData.GetStandardDeviation<T>(columnIndex, considerSelection, emptyValue);
     296    }
     297    public T GetVariance<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     298      return ActiveData.GetVariance<T>(columnIndex, considerSelection, emptyValue);
     299    }
     300    public T GetQuantile<T>(double alpha, int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
     301      return ActiveData.GetQuantile<T>(alpha, columnIndex, considerSelection, emptyValue);
     302    }
     303    public int GetDistinctValues<T>(int columnIndex, bool considerSelection = false) {
     304      return ActiveData.GetDistinctValues<T>(columnIndex, considerSelection);
     305    }
     306
     307    public int GetMissingValueCount() {
     308      return ActiveData.GetMissingValueCount();
     309    }
     310    public int GetMissingValueCount(int columnIndex) {
     311      return ActiveData.GetMissingValueCount(columnIndex);
     312    }
     313    public int GetRowMissingValueCount(int rowIndex) {
     314      return ActiveData.GetRowMissingValueCount(rowIndex);
    279315    }
    280316    #endregion
  • branches/DataPreprocessing Cleanup/HeuristicLab.DataPreprocessing/3.4/Data/IPreprocessingData.cs

    r15309 r15431  
    2828namespace HeuristicLab.DataPreprocessing {
    2929  public interface IPreprocessingData : INamedItem {
    30 
    31     IList<PreprocessingDataColumn> DataColumns { get; }
    32 
    3330    #region Cells
    3431    bool IsCellEmpty(int columnIndex, int rowIndex);
     
    3936    string GetCellAsString(int columnIndex, int rowIndex);
    4037
    41     IEnumerable<T> GetValues<T>(int columnIndex, bool considerSelection = false);
     38    IList<T> GetValues<T>(int columnIndex, bool considerSelection = false);
    4239
    43     void SetValues<T>(int columnIndex, IEnumerable<T> values);
     40    void SetValues<T>(int columnIndex, IList<T> values);
    4441    bool SetValue(string value, int columnIndex, int rowIndex);
    4542
     
    5148    void InsertRow(int rowIndex);
    5249    void DeleteRow(int rowIndex);
    53     void DeleteRows(IEnumerable<int> rows);
     50    void DeleteRowsWithIndices(IEnumerable<int> rows);
    5451    void InsertColumn<T>(string variableName, int columnIndex);
    5552
     
    109106    void EndTransaction();
    110107    #endregion
     108
     109    #region Statistics
     110    T GetMin<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T));
     111    T GetMax<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T));
     112    T GetMean<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T));
     113    T GetMedian<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T>;
     114    T GetMode<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IEquatable<T>;
     115    T GetStandardDeviation<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T));
     116    T GetVariance<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T));
     117    T GetQuantile<T>(double alpha, int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T>;
     118    int GetDistinctValues<T>(int columnIndex, bool considerSelection = false);
     119
     120    int GetMissingValueCount();
     121    int GetMissingValueCount(int columnIndex);
     122    int GetRowMissingValueCount(int rowIndex);
     123    #endregion
    111124  }
    112125}
  • branches/DataPreprocessing Cleanup/HeuristicLab.DataPreprocessing/3.4/Data/PreprocessingData.cs

    r15309 r15431  
    3232
    3333namespace HeuristicLab.DataPreprocessing {
     34
    3435  [Item("PreprocessingData", "Represents data used for preprocessing.")]
    3536  [StorableClass]
    3637  public class PreprocessingData : NamedItem, IPreprocessingData {
    3738
    38     [Storable] private List<PreprocessingDataColumn> dataColumns;
    39 
    40     public IList<PreprocessingDataColumn> DataColumns {
    41       get { return dataColumns; }
    42     }
    43 
     39    [Storable]
     40    protected IList<IList> variableValues;
     41    [Storable]
     42    protected IList<string> variableNames;
    4443
    4544    #region Constructor, Cloning & Persistence
     
    4847      Name = "Preprocessing Data";
    4948
    50       dataColumns = new List<PreprocessingDataColumn>();
    5149      Transformations = new List<ITransformation>();
    5250      selection = new Dictionary<int, IList<int>>();
     
    5957    protected PreprocessingData(PreprocessingData original, Cloner cloner)
    6058      : base(original, cloner) {
    61       dataColumns = new List<PreprocessingDataColumn>(original.dataColumns.Select(cloner.Clone));
    62       TrainingPartition = cloner.Clone(original.TrainingPartition);
    63       TestPartition = cloner.Clone(original.TestPartition);
     59      variableValues = CopyVariableValues(original.variableValues);
     60      variableNames = new List<string>(original.variableNames);
     61      TrainingPartition = (IntRange)original.TrainingPartition.Clone(cloner);
     62      TestPartition = (IntRange)original.TestPartition.Clone(cloner);
    6463      Transformations = new List<ITransformation>(original.Transformations.Select(cloner.Clone));
    6564
     
    10099    #region Cells
    101100    public bool IsCellEmpty(int columnIndex, int rowIndex) {
    102       return !dataColumns[columnIndex].IsValidValue(rowIndex);
     101      var value = variableValues[columnIndex][rowIndex];
     102      return IsMissingValue(value);
    103103    }
    104104
    105105    public T GetCell<T>(int columnIndex, int rowIndex) {
    106       return dataColumns[columnIndex].TypeSwitch<T>(
    107         c => c[rowIndex],
    108         c => c[rowIndex],
    109         c => c[rowIndex]);
     106      return (T)variableValues[columnIndex][rowIndex];
    110107    }
    111108
     
    118115        InsertColumn<T>(i.ToString(), i);
    119116
    120       dataColumns[columnIndex].TypeSwitch<T>(value,
    121         (c, v) => c[rowIndex] = v,
    122         (c, v) => c[rowIndex] = v,
    123         (c, v) => c[rowIndex] = v);
    124 
     117      variableValues[columnIndex][rowIndex] = value;
    125118      if (!IsInTransaction)
    126119        OnChanged(DataPreprocessingChangedEventType.ChangeItem, columnIndex, rowIndex);
     
    128121
    129122    public string GetCellAsString(int columnIndex, int rowIndex) {
    130       return dataColumns[columnIndex].GetValue(rowIndex);
    131     }
    132 
    133     public IEnumerable<T> GetValues<T>(int columnIndex, bool considerSelection) {
    134       return dataColumns[columnIndex].TypeSwitch<T>(
    135         c => c.GetValues(considerSelection ? selection[columnIndex] : null),
    136         c => c.GetValues(considerSelection ? selection[columnIndex] : null),
    137         c => c.GetValues(considerSelection ? selection[columnIndex] : null));
    138     }
    139 
    140     public void SetValues<T>(int columnIndex, IEnumerable<T> values) {
     123      return variableValues[columnIndex][rowIndex].ToString();
     124    }
     125
     126    public IList<T> GetValues<T>(int columnIndex, bool considerSelection) {
     127      if (considerSelection) {
     128        var list = new List<T>();
     129        foreach (var rowIdx in selection[columnIndex]) {
     130          list.Add((T)variableValues[columnIndex][rowIdx]);
     131        }
     132        return list;
     133      } else {
     134        return (IList<T>)variableValues[columnIndex];
     135      }
     136    }
     137
     138    public void SetValues<T>(int columnIndex, IList<T> values) {
    141139      SaveSnapshot(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
    142140      if (VariableHasType<T>(columnIndex)) {
    143         var name = dataColumns[columnIndex].Name;
    144         if (dataColumns[columnIndex].IsType<double>()) {
    145           dataColumns[columnIndex] = new DoublePreprocessingDataColumn(name, (IEnumerable<double>)values);
    146         } else if (dataColumns[columnIndex].IsType<string>()) {
    147           dataColumns[columnIndex] = new StringPreprocessingDataColumn(name, (IEnumerable<string>)values);
    148         } else if (dataColumns[columnIndex].IsType<DateTime>()) {
    149           dataColumns[columnIndex] = new DateTimePreprocessingDataColumn(name, (IEnumerable<DateTime>)values);
     141        variableValues[columnIndex] = (IList)values;
     142      } else {
     143        throw new ArgumentException("The datatype of column " + columnIndex + " must be of type " + variableValues[columnIndex].GetType().Name + " but was " + typeof(T).Name);
     144      }
     145      if (!IsInTransaction)
     146        OnChanged(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
     147    }
     148
     149    public bool SetValue(string value, int columnIndex, int rowIndex) {
     150      bool valid = false;
     151      if (VariableHasType<double>(columnIndex)) {
     152        double val;
     153        if (string.IsNullOrWhiteSpace(value)) {
     154          val = double.NaN;
     155          valid = true;
    150156        } else {
    151           throw new ArgumentException("Unknown column type");
    152         }
     157          valid = double.TryParse(value, out val);
     158        }
     159        if (valid)
     160          SetCell(columnIndex, rowIndex, val);
     161      } else if (VariableHasType<string>(columnIndex)) {
     162        valid = value != null;
     163        if (valid)
     164          SetCell(columnIndex, rowIndex, value);
     165      } else if (VariableHasType<DateTime>(columnIndex)) {
     166        DateTime date;
     167        valid = DateTime.TryParse(value, out date);
     168        if (valid)
     169          SetCell(columnIndex, rowIndex, date);
    153170      } else {
    154         throw new ArgumentException("The datatype of column " + columnIndex + " must be of type " + dataColumns[columnIndex].GetType().Name + " but was " + typeof(T).Name);
    155       }
     171        throw new ArgumentException("column " + columnIndex + " contains a non supported type.");
     172      }
     173
    156174      if (!IsInTransaction)
    157175        OnChanged(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
    158     }
    159 
    160     public bool SetValue(string value, int columnIndex, int rowIndex) {
    161       var column = dataColumns[columnIndex];
    162       bool successful = column.SetValue(value, rowIndex);
    163 
    164       if (!IsInTransaction)
    165         OnChanged(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
    166 
    167       return successful;
     176
     177      return valid;
    168178    }
    169179
    170180    public int Columns {
    171       get { return dataColumns.Count; }
     181      get { return variableNames.Count; }
    172182    }
    173183
    174184    public int Rows {
    175       get { return dataColumns.Any() ? dataColumns.Max(c => c.Length) : 0; }
     185      get { return variableValues.Count > 0 ? variableValues[0].Count : 0; }
     186    }
     187
     188    public static bool IsMissingValue(object value) {
     189      if (value is double) return double.IsNaN((double)value);
     190      if (value is string) return string.IsNullOrEmpty((string)value);
     191      if (value is DateTime) return ((DateTime)value).Equals(DateTime.MinValue);
     192      throw new ArgumentException();
    176193    }
    177194    #endregion
     
    180197    public void InsertRow(int rowIndex) {
    181198      SaveSnapshot(DataPreprocessingChangedEventType.DeleteRow, -1, rowIndex);
    182 
    183       foreach (var column in dataColumns) {
    184         column.TypeSwitch(
    185           c => c.Values.Insert(rowIndex, double.NaN),
    186           c => c.Values.Insert(rowIndex, null),
    187           c => c.Values.Insert(rowIndex, DateTime.MinValue));
    188       }
    189 
     199      foreach (IList column in variableValues) {
     200        Type type = column.GetType().GetGenericArguments()[0];
     201        column.Insert(rowIndex, type.IsValueType ? Activator.CreateInstance(type) : null);
     202      }
    190203      if (TrainingPartition.Start <= rowIndex && rowIndex <= TrainingPartition.End) {
    191204        TrainingPartition.End++;
     
    201214        }
    202215      }
    203 
    204216      if (!IsInTransaction)
    205217        OnChanged(DataPreprocessingChangedEventType.AddRow, -1, rowIndex);
    206218    }
    207 
    208219    public void DeleteRow(int rowIndex) {
    209       DeleteRows(new[] { rowIndex });
    210     }
    211     public void DeleteRows(IEnumerable<int> rowIndices) {
     220      SaveSnapshot(DataPreprocessingChangedEventType.AddRow, -1, rowIndex);
     221      foreach (IList column in variableValues) {
     222        column.RemoveAt(rowIndex);
     223      }
     224      if (TrainingPartition.Start <= rowIndex && rowIndex <= TrainingPartition.End) {
     225        TrainingPartition.End--;
     226        if (TrainingPartition.End <= TestPartition.Start) {
     227          TestPartition.Start--;
     228          TestPartition.End--;
     229        }
     230      } else if (TestPartition.Start <= rowIndex && rowIndex <= TestPartition.End) {
     231        TestPartition.End--;
     232        if (TestPartition.End <= TrainingPartition.Start) {
     233          TestPartition.Start--;
     234          TestPartition.End--;
     235        }
     236      }
     237      if (!IsInTransaction)
     238        OnChanged(DataPreprocessingChangedEventType.DeleteRow, -1, rowIndex);
     239    }
     240    public void DeleteRowsWithIndices(IEnumerable<int> rows) {
    212241      SaveSnapshot(DataPreprocessingChangedEventType.AddRow, -1, -1);
    213 
    214       foreach (int rowIndex in rowIndices.OrderByDescending(x => x)) {
    215         foreach (var column in dataColumns) {
    216           column.TypeSwitch(
    217             c => c.Values.RemoveAt(rowIndex),
    218             c => c.Values.RemoveAt(rowIndex),
    219             c => c.Values.RemoveAt(rowIndex));
    220         }
    221 
     242      foreach (int rowIndex in rows.OrderByDescending(x => x)) {
     243        foreach (IList column in variableValues) {
     244          column.RemoveAt(rowIndex);
     245        }
    222246        if (TrainingPartition.Start <= rowIndex && rowIndex <= TrainingPartition.End) {
    223247          TrainingPartition.End--;
     
    234258        }
    235259      }
    236 
    237260      if (!IsInTransaction)
    238261        OnChanged(DataPreprocessingChangedEventType.DeleteRow, -1, -1);
     
    241264    public void InsertColumn<T>(string variableName, int columnIndex) {
    242265      SaveSnapshot(DataPreprocessingChangedEventType.DeleteColumn, columnIndex, -1);
    243 
    244       if (typeof(T) == typeof(double)) {
    245         dataColumns.Insert(columnIndex, new DoublePreprocessingDataColumn(variableName, Enumerable.Repeat<double>(double.NaN, Rows)));
    246       } else if (typeof(T) == typeof(string)) {
    247         dataColumns.Insert(columnIndex, new StringPreprocessingDataColumn(variableName, Enumerable.Repeat<string>(string.Empty, Rows)));
    248       } else if (typeof(T) == typeof(DateTime)) {
    249         dataColumns.Insert(columnIndex, new DateTimePreprocessingDataColumn(variableName, Enumerable.Repeat<DateTime>(DateTime.MinValue, Rows)));
    250       } else {
    251         throw new ArgumentException("The datatype of column " + variableName + " must be of type double, string or DateTime");
    252       }
    253 
     266      variableValues.Insert(columnIndex, new List<T>(Enumerable.Repeat(default(T), Rows)));
     267      variableNames.Insert(columnIndex, variableName);
    254268      if (!IsInTransaction)
    255269        OnChanged(DataPreprocessingChangedEventType.AddColumn, columnIndex, -1);
     
    258272    public void DeleteColumn(int columnIndex) {
    259273      SaveSnapshot(DataPreprocessingChangedEventType.AddColumn, columnIndex, -1);
    260 
    261       dataColumns.RemoveAt(columnIndex);
    262 
     274      variableValues.RemoveAt(columnIndex);
     275      variableNames.RemoveAt(columnIndex);
    263276      if (!IsInTransaction)
    264277        OnChanged(DataPreprocessingChangedEventType.DeleteColumn, columnIndex, -1);
     
    266279
    267280    public void RenameColumn(int columnIndex, string name) {
    268       if (columnIndex < 0 || columnIndex > dataColumns.Count)
     281      SaveSnapshot(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
     282      if (columnIndex < 0 || columnIndex > variableNames.Count)
    269283        throw new ArgumentOutOfRangeException("columnIndex");
    270 
    271       SaveSnapshot(DataPreprocessingChangedEventType.ChangeColumn, columnIndex, -1);
    272 
    273       dataColumns[columnIndex].Name = name;
     284      variableNames[columnIndex] = name;
    274285
    275286      if (!IsInTransaction)
     
    279290    public void RenameColumns(IList<string> names) {
    280291      if (names == null) throw new ArgumentNullException("names");
    281       if (names.Count != dataColumns.Count) throw new ArgumentException("number of names must match the number of columns.", "names");
     292      if (names.Count != variableNames.Count) throw new ArgumentException("number of names must match the number of columns.", "names");
    282293
    283294      SaveSnapshot(DataPreprocessingChangedEventType.ChangeColumn, -1, -1);
    284 
    285295      for (int i = 0; i < names.Count; i++)
    286         dataColumns[i].Name = names[i];
     296        variableNames[i] = names[i];
    287297
    288298      if (!IsInTransaction)
     
    291301
    292302    public bool AreAllStringColumns(IEnumerable<int> columnIndices) {
    293       return columnIndices.All(VariableHasType<string>);
     303      return columnIndices.All(x => VariableHasType<string>(x));
    294304    }
    295305    #endregion
     
    297307    #region Variables
    298308    public IEnumerable<string> VariableNames {
    299       get { return dataColumns.Select(c => c.Name); }
     309      get { return variableNames; }
    300310    }
    301311
    302312    public IEnumerable<string> GetDoubleVariableNames() {
    303       return dataColumns.OfType<DoublePreprocessingDataColumn>().Select(c => c.Name);
     313      var doubleVariableNames = new List<string>();
     314      for (int i = 0; i < Columns; ++i) {
     315        if (VariableHasType<double>(i)) {
     316          doubleVariableNames.Add(variableNames[i]);
     317        }
     318      }
     319      return doubleVariableNames;
    304320    }
    305321
    306322    public string GetVariableName(int columnIndex) {
    307       return dataColumns[columnIndex].Name;
     323      return variableNames[columnIndex];
    308324    }
    309325
    310326    public int GetColumnIndex(string variableName) {
    311       return dataColumns.FindIndex(c => c.Name == variableName);
     327      return variableNames.IndexOf(variableName);
    312328    }
    313329
    314330    public bool VariableHasType<T>(int columnIndex) {
    315       return dataColumns[columnIndex].IsType<T>();
     331      return columnIndex >= variableValues.Count || variableValues[columnIndex] is List<T>;
    316332    }
    317333
    318334    public Type GetVariableType(int columnIndex) {
    319       return dataColumns[columnIndex].GetValueType();
     335      var listType = variableValues[columnIndex].GetType();
     336      return listType.GenericTypeArguments.Single();
    320337    }
    321338
     
    375392    #region Import & Export
    376393    public void Import(IDataAnalysisProblemData problemData) {
    377       var dataset = problemData.Dataset;
     394      Dataset dataset = (Dataset)problemData.Dataset;
     395      variableNames = new List<string>(problemData.Dataset.VariableNames);
    378396      InputVariables = new List<string>(problemData.AllowedInputVariables);
    379       TargetVariable = problemData is IRegressionProblemData ? ((IRegressionProblemData)problemData).TargetVariable
    380         : problemData is IClassificationProblemData ? ((IClassificationProblemData)problemData).TargetVariable
    381         : null;
    382 
    383       dataColumns.Clear();
     397      TargetVariable = (problemData is IRegressionProblemData) ? ((IRegressionProblemData)problemData).TargetVariable
     398        : (problemData is IClassificationProblemData) ? ((IClassificationProblemData)problemData).TargetVariable
     399          : null;
     400
     401      int columnIndex = 0;
     402      variableValues = new List<IList>();
    384403      foreach (var variableName in problemData.Dataset.VariableNames) {
    385404        if (dataset.VariableHasType<double>(variableName)) {
    386           dataColumns.Add(new DoublePreprocessingDataColumn(variableName, dataset.GetDoubleValues(variableName)));
     405          variableValues.Insert(columnIndex, dataset.GetDoubleValues(variableName).ToList());
    387406        } else if (dataset.VariableHasType<string>(variableName)) {
    388           dataColumns.Add(new StringPreprocessingDataColumn(variableName, dataset.GetStringValues(variableName)));
     407          variableValues.Insert(columnIndex, dataset.GetStringValues(variableName).ToList());
    389408        } else if (dataset.VariableHasType<DateTime>(variableName)) {
    390           dataColumns.Add(new DateTimePreprocessingDataColumn(variableName, dataset.GetDateTimeValues(variableName)));
     409          variableValues.Insert(columnIndex, dataset.GetDateTimeValues(variableName).ToList());
    391410        } else {
    392411          throw new ArgumentException("The datatype of column " + variableName + " must be of type double, string or DateTime");
    393412        }
     413        ++columnIndex;
    394414      }
    395415
     
    401421      IList<IList> values = new List<IList>();
    402422
    403       for (int i = 0; i < Columns; i++) {
    404         var doubleColumn = dataColumns[i] as DoublePreprocessingDataColumn;
    405         var stringColumn = dataColumns[i] as StringPreprocessingDataColumn;
    406         var dateTimeColumn = dataColumns[i] as DateTimePreprocessingDataColumn;
    407         if (doubleColumn != null) values.Add(new List<double>(doubleColumn.GetValues()));
    408         else if (stringColumn != null) values.Add(new List<string>(stringColumn.GetValues()));
    409         else if (dateTimeColumn != null) values.Add(new List<DateTime>(dateTimeColumn.GetValues()));
    410         else throw new InvalidOperationException("Column type not supported for export");
    411       }
    412 
    413       return new Dataset(VariableNames, values);
     423      for (int i = 0; i < Columns; ++i) {
     424        values.Add(variableValues[i]);
     425      }
     426
     427      var dataset = new Dataset(variableNames, values);
     428      return dataset;
    414429    }
    415430    #endregion
     
    437452
    438453    #region Transactions
    439     // Snapshot/History are not storable/cloneable on purpose
     454    // Stapshot/History are nost storable/cloneable on purpose
    440455    private class Snapshot {
    441       public List<PreprocessingDataColumn> DataColumns { get; set; }
     456      public IList<IList> VariableValues { get; set; }
     457      public IList<string> VariableNames { get; set; }
    442458
    443459      public IntRange TrainingPartition { get; set; }
     
    456472    }
    457473
    458     private const int MaxUndoDepth = 5;
     474    private const int MAX_UNDO_DEPTH = 5;
    459475
    460476    private readonly IList<Snapshot> undoHistory = new List<Snapshot>();
     
    466482      if (IsInTransaction) return;
    467483
    468       var cloner = new Cloner();
    469484      var currentSnapshot = new Snapshot {
    470         DataColumns = new List<PreprocessingDataColumn>(dataColumns.Select(cloner.Clone)),
     485        VariableValues = CopyVariableValues(variableValues),
     486        VariableNames = new List<string>(variableNames),
    471487        TrainingPartition = new IntRange(TrainingPartition.Start, TrainingPartition.End),
    472488        TestPartition = new IntRange(TestPartition.Start, TestPartition.End),
     
    477493      };
    478494
    479       if (undoHistory.Count >= MaxUndoDepth)
     495      if (undoHistory.Count >= MAX_UNDO_DEPTH)
    480496        undoHistory.RemoveAt(0);
    481497
     
    490506      if (IsUndoAvailable) {
    491507        Snapshot previousSnapshot = undoHistory[undoHistory.Count - 1];
    492         dataColumns = previousSnapshot.DataColumns;
     508        variableValues = previousSnapshot.VariableValues;
     509        variableNames = previousSnapshot.VariableNames;
    493510        TrainingPartition = previousSnapshot.TrainingPartition;
    494511        TestPartition = previousSnapshot.TestPartition;
     
    521538    #endregion
    522539
    523     /* #region Statistics
    524      public T GetMin<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
    525        try {
    526          return dataColumns[columnIndex].TypeSwitch<T>(
    527            col => col.GetMin(considerSelection ? Selection[columnIndex] : null),
    528            col => col.GetMin(considerSelection ? Selection[columnIndex] : null),
    529            col => col.GetMin(considerSelection ? Selection[columnIndex] : null));
    530        } catch (InvalidOperationException) {
    531          return emptyValue;
    532        }
    533      }
    534 
    535      public T GetMax<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
    536        var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
    537        return values.Any() ? values.Max() : emptyValue;
    538      }
    539 
    540      public T GetMean<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
    541        return
    542 
    543 
    544        if (typeof(T) == typeof(double)) {
    545          var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
    546          return values.Any() ? Convert<T>(values.Average()) : emptyValue;
    547        }
    548        if (typeof(T) == typeof(string)) {
    549          return Convert<T>(string.Empty);
    550        }
    551        if (typeof(T) == typeof(DateTime)) {
    552          var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
    553          return values.Any() ? Convert<T>(AggregateAsDouble(values, Enumerable.Average)) : emptyValue;
    554        }
    555 
    556        throw new InvalidOperationException(typeof(T) + " not supported");
    557      }
    558 
    559      public T GetMedian<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
    560        if (typeof(T) == typeof(double)) {// IEnumerable<double> is faster 
    561          var doubleValues = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
    562          return doubleValues.Any() ? Convert<T>(doubleValues.Median()) : emptyValue;
    563        }
    564        var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
    565        return values.Any() ? values.Quantile(0.5) : emptyValue;
    566      }
    567 
    568      public T GetMode<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IEquatable<T> {
    569        var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
    570        return values.Any() ? values.GroupBy(x => x).OrderByDescending(g => g.Count()).Select(g => g.Key).First() : emptyValue;
    571      }
    572 
    573      public T GetStandardDeviation<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
    574        if (typeof(T) == typeof(double)) {
    575          var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
    576          return values.Any() ? Convert<T>(values.StandardDeviation()) : emptyValue;
    577        }
    578        // For DateTime, std.dev / variance would have to be TimeSpan
    579        //if (typeof(T) == typeof(DateTime)) {
    580        //  var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
    581        //  return values.Any() ? Convert<T>(AggregateAsDouble(values, EnumerableStatisticExtensions.StandardDeviation)) : emptyValue;
    582        //}
    583        return default(T);
    584      }
    585 
    586      public T GetVariance<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
    587        if (typeof(T) == typeof(double)) {
    588          var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
    589          return values.Any() ? Convert<T>(values.Variance()) : emptyValue;
    590        }
    591        // DateTime variance often overflows long, thus the corresponding DateTime is invalid
    592        //if (typeof(T) == typeof(DateTime)) {
    593        //  var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
    594        //  return values.Any() ? Convert<T>(AggregateAsDouble(values, EnumerableStatisticExtensions.Variance)) : emptyValue;
    595        //}
    596        return default(T);
    597      }
    598 
    599      public T GetQuantile<T>(double alpha, int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
    600        if (typeof(T) == typeof(double)) {// IEnumerable<double> is faster 
    601          var doubleValues = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
    602          return doubleValues.Any() ? Convert<T>(doubleValues.Quantile(alpha)) : emptyValue;
    603        }
    604        var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
    605        return values.Any() ? values.Quantile(alpha) : emptyValue;
    606      }
    607 
    608      public int GetDistinctValues<T>(int columnIndex, bool considerSelection = false) {
    609        var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
    610        return values.GroupBy(x => x).Count();
    611      }
    612 
    613      private IEnumerable<T> GetValuesWithoutMissingValues<T>(int columnIndex, bool considerSelection) {
    614        return GetValues<T>(columnIndex, considerSelection).Where(x =>
    615          ColumnTypeSwitch<T, bool>(dataColumns[columnIndex], x,
    616            (c, v) => c.IsValidValue(v),
    617            (c, v) => c.IsValidValue(v),
    618            (c, v) => c.IsValidValue(v)
    619        ));
    620      }
    621 
    622      private static DateTime AggregateAsDouble(IEnumerable<DateTime> values, Func<IEnumerable<double>, double> func) {
    623        return new DateTime((long)(func(values.Select(x => (double)x.Ticks / TimeSpan.TicksPerSecond)) * TimeSpan.TicksPerSecond));
    624      }
    625 
    626      public int GetMissingValueCount() {
    627        int count = 0;
    628        for (int i = 0; i < Columns; ++i) {
    629          count += GetMissingValueCount(i);
    630        }
    631        return count;
    632      }
    633      public int GetMissingValueCount(int columnIndex) {
    634        int sum = 0;
    635        for (int i = 0; i < Rows; i++) {
    636          if (IsCellEmpty(columnIndex, i))
    637            sum++;
    638        }
    639        return sum;
    640      }
    641      public int GetRowMissingValueCount(int rowIndex) {
    642        int sum = 0;
    643        for (int i = 0; i < Columns; i++) {
    644          if (IsCellEmpty(i, rowIndex))
    645            sum++;
    646        }
    647        return sum;
    648      }
    649      #endregion  */
     540    #region Statistics
     541    public T GetMin<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     542      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     543      return values.Any() ? values.Min() : emptyValue;
     544    }
     545
     546    public T GetMax<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     547      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     548      return values.Any() ? values.Max() : emptyValue;
     549    }
     550
     551    public T GetMean<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     552      if (typeof(T) == typeof(double)) {
     553        var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
     554        return values.Any() ? Convert<T>(values.Average()) : emptyValue;
     555      }
     556      if (typeof(T) == typeof(string)) {
     557        return Convert<T>(string.Empty);
     558      }
     559      if (typeof(T) == typeof(DateTime)) {
     560        var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
     561        return values.Any() ? Convert<T>(AggregateAsDouble(values, Enumerable.Average)) : emptyValue;
     562      }
     563
     564      throw new InvalidOperationException(typeof(T) + " not supported");
     565    }
     566
     567    public T GetMedian<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
     568      if (typeof(T) == typeof(double)) {// IEnumerable<double> is faster 
     569        var doubleValues = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
     570        return doubleValues.Any() ? Convert<T>(doubleValues.Median()) : emptyValue;
     571      }
     572      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     573      return values.Any() ? values.Quantile(0.5) : emptyValue;
     574    }
     575
     576    public T GetMode<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IEquatable<T> {
     577      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     578      return values.Any() ? values.GroupBy(x => x).OrderByDescending(g => g.Count()).Select(g => g.Key).First() : emptyValue;
     579    }
     580
     581    public T GetStandardDeviation<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     582      if (typeof(T) == typeof(double)) {
     583        var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
     584        return values.Any() ? Convert<T>(values.StandardDeviation()) : emptyValue;
     585      }
     586      // For DateTime, std.dev / variance would have to be TimeSpan
     587      //if (typeof(T) == typeof(DateTime)) {
     588      //  var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
     589      //  return values.Any() ? Convert<T>(AggregateAsDouble(values, EnumerableStatisticExtensions.StandardDeviation)) : emptyValue;
     590      //}
     591      return default(T);
     592    }
     593
     594    public T GetVariance<T>(int columnIndex, bool considerSelection = false, T emptyValue = default(T)) {
     595      if (typeof(T) == typeof(double)) {
     596        var values = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
     597        return values.Any() ? Convert<T>(values.Variance()) : emptyValue;
     598      }
     599      // DateTime variance often overflows long, thus the corresponding DateTime is invalid
     600      //if (typeof(T) == typeof(DateTime)) {
     601      //  var values = GetValuesWithoutMissingValues<DateTime>(columnIndex, considerSelection);
     602      //  return values.Any() ? Convert<T>(AggregateAsDouble(values, EnumerableStatisticExtensions.Variance)) : emptyValue;
     603      //}
     604      return default(T);
     605    }
     606
     607    public T GetQuantile<T>(double alpha, int columnIndex, bool considerSelection = false, T emptyValue = default(T)) where T : IComparable<T> {
     608      if (typeof(T) == typeof(double)) {// IEnumerable<double> is faster 
     609        var doubleValues = GetValuesWithoutMissingValues<double>(columnIndex, considerSelection);
     610        return doubleValues.Any() ? Convert<T>(doubleValues.Quantile(alpha)) : emptyValue;
     611      }
     612      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     613      return values.Any() ? values.Quantile(alpha) : emptyValue;
     614    }
     615
     616    public int GetDistinctValues<T>(int columnIndex, bool considerSelection = false) {
     617      var values = GetValuesWithoutMissingValues<T>(columnIndex, considerSelection);
     618      return values.GroupBy(x => x).Count();
     619    }
     620
     621    private IEnumerable<T> GetValuesWithoutMissingValues<T>(int columnIndex, bool considerSelection) {
     622      return GetValues<T>(columnIndex, considerSelection).Where(x => !IsMissingValue(x));
     623    }
     624
     625    private static DateTime AggregateAsDouble(IEnumerable<DateTime> values, Func<IEnumerable<double>, double> func) {
     626      return new DateTime((long)(func(values.Select(x => (double)x.Ticks / TimeSpan.TicksPerSecond)) * TimeSpan.TicksPerSecond));
     627    }
     628    private static T Convert<T>(object obj) { return (T)obj; }
     629
     630    public int GetMissingValueCount() {
     631      int count = 0;
     632      for (int i = 0; i < Columns; ++i) {
     633        count += GetMissingValueCount(i);
     634      }
     635      return count;
     636    }
     637    public int GetMissingValueCount(int columnIndex) {
     638      int sum = 0;
     639      for (int i = 0; i < Rows; i++) {
     640        if (IsCellEmpty(columnIndex, i))
     641          sum++;
     642      }
     643      return sum;
     644    }
     645    public int GetRowMissingValueCount(int rowIndex) {
     646      int sum = 0;
     647      for (int i = 0; i < Columns; i++) {
     648        if (IsCellEmpty(i, rowIndex))
     649          sum++;
     650      }
     651      return sum;
     652    }
     653    #endregion
     654
     655    #region Helpers
     656    private static IList<IList> CopyVariableValues(IList<IList> original) {
     657      var copy = new List<IList>(original);
     658      for (int i = 0; i < original.Count; ++i) {
     659        copy[i] = (IList)Activator.CreateInstance(original[i].GetType(), original[i]);
     660      }
     661      return copy;
     662    }
     663    #endregion
    650664  }
    651665
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