Reporting results – attributes

Reporting results - attributes

Once the optimization is complete, we can query the values of the attributes. In particular, we can query the VarName and X attributes to obtain the name and solution value of each variable:

  cout << x.get(GRB_StringAttr_VarName) << " "
       << x.get(GRB_DoubleAttr_X) << endl;
  cout << y.get(GRB_StringAttr_VarName) << " "
       << y.get(GRB_DoubleAttr_X) << endl;
  cout << z.get(GRB_StringAttr_VarName) << " "
       << z.get(GRB_DoubleAttr_X) << endl;

We can also query the ObjVal attribute on the model to obtain the objective value for the current solution:

  cout << "Obj: " << model.get(GRB_DoubleAttr_ObjVal) << endl;

The names and types of all model, variable, and constraint attributes can be found in the Attributes section of the Gurobi Reference Manual.