Originally posted by: yipingfang

Hello, guys, does anybody know what's the difference between the following two declaration codes:

 

Part One:

var masterDef = thisOplModel.modelDefinition;

var masterData = thisOplModel.dataElements;

var masterOpl = new IloOplModel(masterDef, cplex);

masterOpl.addDataSource(masterData);

masterOpl.generate();

var subSource = new IloOplModelSource("sub_MP.mod");

var subDef = new IloOplModelDefinition(subSource);

var subData = new IloOplDataSource("test_subMP.dat");

var subCplex = new IloCplex();

var subOpl = new IloOplModel(subDef, subCplex);

subOpl.addDataSource(subData);

subOpl.generate();

 

Part Two:

var masterDef = thisOplModel.modelDefinition;

var masterData = thisOplModel.dataElements;

var masterOpl = new IloOplModel(masterDef, cplex);

masterOpl.addDataSource(masterData);

masterOpl.generate();

var subSource = new IloOplModelSource("sub_MP.mod");

var subDef = new IloOplModelDefinition(subSource);

var subData = new IloOplDataSource("test_subMP.dat");

var subOpl = new IloOplModel(subDef, cplex);

subOpl.addDataSource(subData);

subOpl.generate();

 

The only difference is the definition of IloCplex() for subModel. I find that this difference can lead to completely different result. Is anyone know why? Thanks!

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi

they are two different instances of IloCplex class.

cplex is the default one.

Let me give you a small example:

execute
{
cplex.tilim=20;
}

main
{
thisOplModel.generate();
writeln("cplex.tilim=",cplex.tilim);
var engine=new IloCplex();
writeln("engine.tilim=",engine.tilim);
writeln("cplex.tilim=",cplex.tilim);

}

gives

cplex.tilim=20
engine.tilim=9.999999999999999e+074
cplex.tilim=20

regards

 

#DecisionOptimization
#OPLusingCPLEXOptimizer