How the flow control script works

Illustrated via the model solpoolscript.mod.

The model solpoolscript.mod is a variation of scalableWarehouse.mod and has been written to illustrate how the flow control script works. It contains the main flow control script shown in the following code extract.

main {
    thisOplModel.generate();
    cplex.solve();
    if (cplex.populate()) {
      var nsolns = cplex.solnPoolNsolns;
      writeln("Number of solutions found = ",nsolns);
      writeln();
      for (var s=0; s<nsolns; s++) {
        thisOplModel.setPoolSolution(s);
        writeln("solution #", s, ": objective = ", cplex.getObjValue(s));
        write("Open = [ ");
        for (var i in thisOplModel.Warehouses)
          write(thisOplModel.Open[i], " ");
        writeln("]");  
        writeln("---------");
      }
    }
}

This flow control script

1. creates and extracts the model, and populates the solution pool after a regular MIP solve

       thisOplModel.generate();
       cplex.solve();
       if (cplex.populate()) {
   

2. gets the number of solutions in the solution pool

         var nsolns = cplex.solnPoolNsolns;
         writeln("Number of solutions found = ",nsolns);
   

3. uses the solutions in the model

         writeln();
         for (var s=0; s<nsolns; s++) {
           thisOplModel.setPoolSolution(s);
   

4. gets the objective values for those solutions

           writeln("solution #", s, ": objective = ", cplex.getObjValue(s));
   

5. writes the results to the Scripting Log

           write("Open = [ ");
           for (var i in thisOplModel.Warehouses)
             write(thisOplModel.Open[i], " ");
           writeln("]");  
           writeln("---------");