SMILE Tutorial Code 1: Creating a Bayesian Network

From DSL

  void CreateNetwork(void) {
    DSL_network theNet;
    
    // create node "Success"
    int success = theNet.AddNode(DSL_CPT,"Success");
    
    // setting number (and name) of outcomes
    DSL_idArray someNames;
    someNames.Add("Success");
    someNames.Add("Failure");
    theNet.GetNode(success)->Definition()->SetNumberOfOutcomes(someNames);  
 
    // create node "Forecast"
    int forecast = theNet.AddNode(DSL_CPT,"Forecast");
 
    // setting number (and name) of outcomes
    someNames.Flush();
    someNames.Add("Good");
    someNames.Add("Moderate");
    someNames.Add("Poor");
    theNet.GetNode(forecast)->Definition()->SetNumberOfOutcomes(someNames);  
    
     // add arc from "Success" to "Forecast"
     theNet.AddArc(success,forecast);
    
    // now fill in the conditional distribution for node "Success" using
    // direct method. The probabilities are:
    // P("Success" = Success) = 0.2
    // P("Success" = Failure) = 0.8 
    DSL_doubleArray theProbs;
    theProbs.SetSize(2); // it has to be an array
    theProbs[0] = 0.2;
    theProbs[1] = 0.8;
    theNet.GetNode(success)->Definition()->SetDefinition(theProbs);
 
    // now fill in the conditional distribution for node "Forecast" using a system of 
    // coordinates. The probabilities are:
    // P("Forecast" = Good | "Success" = Success) = 0.4
    // P("Forecast" = Moderate | "Success" = Success) = 0.4
    // P("Forecast" = Poor | "Success" = Success) = 0.2
    // P("Forecast" = Good | "Success" = Failure) = 0.1
    // P("Forecast" = Moderate | "Success" = Failure) = 0.3
    // P("Forecast" = Poor | "Success" = Failure) = 0.6
    DSL_sysCoordinates theCoordinates (*theNet.GetNode(forecast)->Definition());
    theCoordinates.UncheckedValue() = 0.4;
    theCoordinates.Next();
    theCoordinates.UncheckedValue() = 0.4;
    theCoordinates.Next();
    theCoordinates.UncheckedValue() = 0.2;
    theCoordinates.Next();
    theCoordinates.UncheckedValue() = 0.1;
    theCoordinates.Next();
    theCoordinates.UncheckedValue() = 0.3;
    theCoordinates.Next();
    theCoordinates.UncheckedValue() = 0.6; 
    theNet.WriteFile("tutorial.dsl");
  };