code: ///////////////////////////////////////////////////////////////////////////////
  // For information as to what this class does, see the Javadoc, below.       //
  // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
  // 2007, 2008, 2009, 2010, 2014, 2015 by Peter Spirtes, Richard Scheines, Joseph   //
  // Ramsey, and Clark Glymour.                                                //
  //                                                                           //
  // This program is free software; you can redistribute it and/or modify      //
  // it under the terms of the GNU General Public License as published by      //
  // the Free Software Foundation; either version 2 of the License, or         //
  // (at your option) any later version.                                       //
  //                                                                           //
  // This program is distributed in the hope that it will be useful,           //
  // but WITHOUT ANY WARRANTY; without even the implied warranty of            //
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
  // GNU General Public License for more details.                              //
  //                                                                           //
  // You should have received a copy of the GNU General Public License         //
  // along with this program; if not, write to the Free Software               //
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
  ///////////////////////////////////////////////////////////////////////////////
  
  package edu.cmu.tetrad.data;
  
  
  /**
   * Makes a new data set in which cases in the given data set that have been
   * assigned multiplicies other than n = 1 are copied out n times. This increases
   * the number of rows in the data set.
   *
   * @author Joseph Ramsey
   */
  public final class CaseExpander implements DataFilter {
  
      /**
       * Expands cases for the given dataset.
       */
      public final DataSet filter(DataSet dataSet) {
          return expand(dataSet);
      }
  
      private static DataSet expand(DataSet dataSet) {
          int rows = 0;
  
          for (int i = 0; i < dataSet.getNumRows(); i++) {
  //            int caseMultiplier = dataSet.getMultiplier(i);
  
  //            for (int k = 0; k < caseMultiplier; k++) {
              ++rows;
  //            }
          }
  
          DataSet newDataSet =
                  new ColtDataSet(rows, dataSet.getVariables());
          int cols = dataSet.getNumColumns();
          int index = -1;
  
          for (int i = 0; i < dataSet.getNumRows(); i++) {
  //            int caseMultiplier = dataSet.getMultiplier(i);
  
  //            for (int k = 0; k < caseMultiplier; k++) {
              ++index;
  
              for (int j = 0; j < cols; j++) {
                  if (dataSet.getVariable(j) instanceof ContinuousVariable) {
                      newDataSet.setDouble(index, j, dataSet.getDouble(i, j));
                  } else if (dataSet.getVariable(j) instanceof DiscreteVariable) {
                      newDataSet.setInt(index, j, dataSet.getInt(i, j));
                  } else {
                      throw new IllegalStateException("Expecting either a " +
                              "continuous or a discrete variable.");
                  }
  
              }
  //            }
          }
  
          return newDataSet;
      }
  }
  
  
  
  
  
  