code: package edu.cmu.tetrad.algcomparison.simulation;
  
  import edu.cmu.tetrad.algcomparison.utils.HasParameterValues;
  import edu.cmu.tetrad.data.*;
  import edu.cmu.tetrad.graph.EdgeListGraph;
  import edu.cmu.tetrad.graph.Graph;
  import edu.cmu.tetrad.graph.GraphUtils;
  import edu.cmu.tetrad.graph.Node;
  import edu.cmu.tetrad.util.Parameters;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * @author jdramsey
   */
  public class LoadContinuousDataSmithSim implements Simulation, HasParameterValues {
      static final long serialVersionUID = 23L;
      private String path;
      private Graph graph = null;
      private List<DataSet> dataSets = new ArrayList<>();
      private List<String> usedParameters = new ArrayList<>();
      private Parameters parametersValues = new Parameters();
  
      public LoadContinuousDataSmithSim(String path) {
          this.path = path;
          String structure = new File(path).getName();
          parametersValues.set("Structure", structure);
      }
  
      @Override
      public void createData(Parameters parameters) {
          this.dataSets = new ArrayList<>();
  
          File dir = new File(path + "/data");
  
          if (dir.exists()) {
              File[] files = dir.listFiles();
  
              for (File file : files) {
                  if (!file.getName().endsWith(".txt")) continue;
                  System.out.println("Loading data from " + file.getAbsolutePath());
                  DataReader reader = new DataReader();
                  reader.setVariablesSupplied(false);
                  reader.setDelimiter(DelimiterType.COMMA);
                  try {
                      DataSet dataSet = reader.parseTabular(file);
                      dataSets.add(dataSet);
                  } catch (Exception e) {
                      System.out.println("Couldn't parse " + file.getAbsolutePath());
                  }
              }
          }
  
          File dir2 = new File(path + "/graph");
  
          if (dir2.exists()) {
              File[] files = dir2.listFiles();
  
              for (File file : files) {
                  if (!file.getName().endsWith(".txt")) continue;
  
                  System.out.println("Loading graph from " + file.getAbsolutePath());
                  this.graph = readGraph(file);
  //            this.graph = GraphUtils.loadGraphTxt(file);
  
  //            if (!graph.isAdjacentTo(graph.getNode("X3"), graph.getNode("X4"))) {
  //                graph.addUndirectedEdge(graph.getNode("X3"), graph.getNode("X4"));
  //            }
  
                  GraphUtils.circleLayout(this.graph, 225, 200, 150);
  
                  break;
              }
          }
  
          if (parameters.get("numRuns") != null) {
              parameters.set("numRuns", parameters.get("numRuns"));
          } else {
              parameters.set("numRuns", dataSets.size());
          }
  
          System.out.println();
      }
  
      @Override
      public Graph getTrueGraph(int index) {
          return this.graph;
      }
  
      @Override
      public DataModel getDataModel(int index) {
          return dataSets.get(index);
      }
  
      public String getDescription() {
          try {
              StringBuilder b = new StringBuilder();
              b.append("Load data sets and graphs from a directory.").append("\n\n");
              return b.toString();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      @Override
      public List<String> getParameters() {
          return usedParameters;
      }
  
      @Override
      public int getNumDataModels() {
          return dataSets.size();
      }
  
      @Override
      public DataType getDataType() {
          return DataType.Continuous;
      }
  
      @Override
      public Parameters getParameterValues() {
          return parametersValues;
      }
  
  
      public Graph readGraph(File file) {
          try {
              DataReader reader = new DataReader();
              reader.setVariablesSupplied(false);
              reader.setDelimiter(DelimiterType.COMMA);
  
              DataSet data = reader.parseTabular(file);
              List<Node> variables = data.getVariables();
              Graph graph = new EdgeListGraph(variables);
  
              for (int i = 0; i < variables.size(); i++) {
                  for (int j = 0; j < variables.size(); j++) {
                      if (i == j) continue;
  
                      if (data.getDouble(i, j) != 0) {
                          graph.addDirectedEdge(variables.get(i), variables.get(j));
                      }
                  }
              }
  
              return graph;
          } catch (IOException e) {
              throw new RuntimeException(e);
          }
      }
  }
  