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.bayes;
  
  import edu.cmu.tetrad.data.DataSet;
  import edu.cmu.tetrad.data.DiscreteVariable;
  import edu.cmu.tetrad.graph.Node;
  
  import java.util.List;
  
  /**
   * Static utility methods for Bayes nets.
   *
   * @author Joseph Ramsey
   */
  final class BayesUtils {
  
      /**
       * Ensures that the discrete variables in the given list are compatible with
       * the variables in the data set by the same names. If a variable x in the
       * list has a superlist of the categories for x in the data, the data
       * variables is changed.
       *
       * @throws IllegalArgumentException if a variable exists in the list for
       *                                  which no variable occurs in the data by
       *                                  the same name or if the variable in the
       *                                  data by the same name does not have a
       *                                  subset of its categories.
       */
      public static void ensureVarsInData(List<Node> pmVars,
                                          DataSet dataSet) {
          for (Node pmVar1 : pmVars) {
              DiscreteVariable pmVar = (DiscreteVariable) pmVar1;
              String name = pmVar.getName();
              DiscreteVariable from =
                      (DiscreteVariable) dataSet.getVariable(name);
  
              if (from == null) {
                  throw new IllegalArgumentException("Variable " + pmVar + " was not in the data.");
              }
  
              List<String> pmCategories = pmVar.getCategories();
              List<String> dataCategories = from.getCategories();
  
              if (!pmCategories.equals(dataCategories)) {
                  if (pmCategories.containsAll(dataCategories)) {
                      DiscreteVariable to = new DiscreteVariable(pmVar);
                      dataSet.changeVariable(from, to);
                  } else {
                      throw new IllegalArgumentException("Variable '" + name + "' " +
                              "has more categories in the data than in the model." +
                              "\n\tIn the model, the categories are: " + pmCategories + "." +
                              "\n\tIn the data, the categories are: " + dataCategories + ".");
                  }
              }
          }
      }
  }
  
  
  
  
  
  