Examples of weka.core.Instances

weka.core.Instances
all the instances in the file (ARFF, CSV, XRFF, ...) DataSource source = new DataSource(filename); Instances instances = source.getDataSet(); // Make the last attribute be the class instances.setClassIndex(instances.numAttributes() - 1); // Print header and instances. System.out.println("\nDataset:\n"); System.out.println(instances); ...
All methods that change a set of instances are safe, ie. a change of a set of instances does not affect any other sets of instances. All methods that change a datasets's attribute information clone the dataset before it is changed. @author Eibe Frank (eibe@cs.waikato.ac.nz) @author Len Trigg (trigg@cs.waikato.ac.nz) @author FracPete (fracpete at waikato dot ac dot nz) @version $Revision: 6996 $

  public String getClassColumn() {
    return m_classColumn;
  }


  public void acceptDataSet(DataSetEvent e) {
    Instances dataSet = e.getDataSet();
    assignClass(dataSet);
    notifyDataListeners(e);
    if (e.isStructureOnly()) {
      m_connectedFormat = e.getDataSet();
      // tell any listening customizers (or other

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      notifyDataFormatListeners();
    }
  }


  public void acceptTrainingSet(TrainingSetEvent e) {
    Instances trainingSet = e.getTrainingSet();
    assignClass(trainingSet);
    notifyTrainingListeners(e);
    
    if (e.isStructureOnly()) {
      m_connectedFormat = e.getTrainingSet();

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      notifyDataFormatListeners();
    }
  }


  public void acceptTestSet(TestSetEvent e) {
    Instances testSet = e.getTestSet();
    assignClass(testSet);
    notifyTestListeners(e);
    if (e.isStructureOnly()) {
      m_connectedFormat = e.getTestSet();
      // tell any listening customizers (or other

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   * @throws Exception if something goes wrong
   */
  private void writeStructure() throws Exception{
  
      StringBuffer query = new StringBuffer();
      Instances structure = getInstances();
      query.append("CREATE TABLE ");
      if(m_tabName || m_tableName.equals(""))
        m_tableName = m_DataBaseConnection.maskKeyword(structure.relationName());
      if(m_DataBaseConnection.getUpperCase()){
        m_tableName = m_tableName.toUpperCase();
        m_createInt = m_createInt.toUpperCase(); 
        m_createDouble = m_createDouble.toUpperCase(); 
        m_createText = m_createText.toUpperCase(); 
        m_createDate = m_createDate.toUpperCase(); 
      }
      m_tableName = m_tableName.replaceAll("[^\\w]","_");
      m_tableName = m_DataBaseConnection.maskKeyword(m_tableName);
      query.append(m_tableName);
      if(structure.numAttributes() == 0)
          throw new Exception("Instances have no attribute.");
      query.append(" ( ");
      if(m_id){
        if(m_DataBaseConnection.getUpperCase())
              m_idColumn = m_idColumn.toUpperCase();
        query.append(m_DataBaseConnection.maskKeyword(m_idColumn));
        query.append(" ");
        query.append(m_createInt);
        query.append(" PRIMARY KEY,");
      }
      for(int i = 0;i < structure.numAttributes(); i++){
          Attribute att = structure.attribute(i);
          String attName = att.name();
          attName = attName.replaceAll("[^\\w]","_");
          attName = m_DataBaseConnection.maskKeyword(attName);
          if(m_DataBaseConnection.getUpperCase())
              query.append(attName.toUpperCase());
          else
              query.append(attName);
          if(att.isDate())
              query.append(" " + m_createDate);
          else{
              if(att.isNumeric())
                  query.append(" "+m_createDouble);
              else
                  query.append(" "+m_createText);
          }
          if(i != structure.numAttributes()-1)
              query.append(", ");
      }
      query.append(" )");
      //System.out.println(query.toString());
      m_DataBaseConnection.update(query.toString());

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   * @throws IOException throws IOEXception.
   */  
  public void writeIncremental(Instance inst) throws IOException{
  
      int writeMode = getWriteMode();
      Instances structure = getInstances();
      
      if(m_DataBaseConnection == null)
           throw new IOException("No database has been set up.");
      if(getRetrieval() == BATCH)
          throw new IOException("Batch and incremental saving cannot be mixed.");

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   * 
   * @throws IOException throws IOException
   */
  public void writeBatch() throws IOException {
  
      Instances instances = getInstances();
      if(instances == null)
          throw new IOException("No instances to save");
      if(getRetrieval() == INCREMENTAL)
          throw new IOException("Batch and incremental saving cannot be mixed.");
      if(m_DataBaseConnection == null)
           throw new IOException("No database has been set up.");
      setRetrieval(BATCH);
      try{
          if(!m_DataBaseConnection.isConnected())
              connectToDatabase();
          setWriteMode(WRITE);
          writeStructure();
          for(int i = 0; i < instances.numInstances(); i++){
            writeInstance(instances.instance(i));
          }
          m_DataBaseConnection.disconnectFromDatabase();
          setWriteMode(WAIT);
          resetStructure();
          m_count = 1;

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  public void acceptDataSet(DataSetEvent e) {
    if (e.isStructureOnly()) {
      if (m_connectedFormat == null ||
    !m_connectedFormat.equalHeaders(e.getDataSet())) { 
  m_connectedFormat = new Instances(e.getDataSet(), 0);
  // tell any listening customizers (or other
  notifyDataFormatListeners();
      }
    }
    Instances dataSet = e.getDataSet();
    Instances newDataSet = assignClassValue(dataSet);
    e = new DataSetEvent(this, newDataSet);
    notifyDataListeners(e);
  }

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  SwapValues sv = new SwapValues();
  sv.setAttributeIndex(""+(dataSet.classIndex()+1));
  sv.setFirstValueIndex("first");
  sv.setSecondValueIndex(""+(m_classValueIndex+1));
  sv.setInputFormat(dataSet);
  Instances newDataSet = Filter.useFilter(dataSet, sv);
  newDataSet.setRelationName(dataSet.relationName());
  return newDataSet;
      } catch (Exception ex) {
  if (m_logger != null) {
    m_logger.
      logMessage("[ClassValuePicker] "

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   * Accept a training set
   *
   * @param e a <code>TrainingSetEvent</code> value
   */
  public void acceptTrainingSet(TrainingSetEvent e) {
    Instances trainingSet = e.getTrainingSet();
    DataSetEvent dse = new DataSetEvent(this, trainingSet);
    acceptDataSet(dse);
  }

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   * Accept a test set
   *
   * @param e a <code>TestSetEvent</code> value
   */
  public void acceptTestSet(TestSetEvent e) {
    Instances testSet = e.getTestSet();
    DataSetEvent dse = new DataSetEvent(this, testSet);
    acceptDataSet(dse);
  }

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