Originally posted by: SystemAdmin

Hi , can anyone help how could i use two model with different engines (CPLEX and CP )in a main block and use the result of one as another input to another one ?
thank you
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

I am not an OPL expert but I once used this snippet to solve the same model with two different IloCplex instances (calls to end() functions omitted):

var model1 = thisOplModel.modelDefinition;
var data1 = thisOplModel.dataElements;
var cplex1 = new IloCplex();
var opl1 = new IloOplModel(model1, cplex1);
opl1.addDataSource(data1);
opl1.generate();
...
cplex1.solve();
...
...
var model2 = thisOplModel.modelDefinition;
var data2 = thisOplModel.dataElements;
var cplex2 = new IloCplex();
var opl2 = new IloOplModel(model2, cplex2);
opl2.addDataSource(data2);
opl2.generate();
...
cplex2.solve();
...

If you replace cplex2 with an instance of IloCP this may work.
In any case, the OPL Forum is probably a better place to ask your question.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Hi Daniel
i have tried replacing it with IloCP but it doesnt work .
in generate() method i have this error "Expecting CP, found CPLEX(default)."
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

The problem is that a .mod file (implicitly) defines which engines you can use to solve it: If the .mod file contains the directive 'using CPLEX;' then you can solve it only with IloCplex(). If the .mode file contains the directive 'using CP;' then you can solve it only with IloCP(). If the .mod file does not contain a 'using' directive then it is treated as if it had 'using CPLEX;'.
You can work around this limitation by creating a .mod file without 'using' directive, copy that file to a new file with explicit 'using' directive and then read that new file. Here is a small example that does that:

range idx = 1 .. 2; dvar int+ x[idx];   minimize 1*x[1] + 3*x[2]; subject to 
{ 4*x[1] + 5*x[2] >= 1; 
}   main 
{ var input; var output; 
// Create a copy of the .mod file that has an explicit 'using CPLEX;' directive. input = 

new IloOplInputFile(
"TwoEngines.mod"); output = 

new IloOplOutputFile(
"TwoEnginesCPLEX.mod"); output.writeln(
"using CPLEX;"); 

while (!input.eof) 
{ output.writeln(input.readline()); 
} output.close(); input.close(); var source1 = 

new IloOplModelSource(
"TwoEnginesCPLEX.mod"); var model1 = 

new IloOplModelDefinition(source1); var engine1 = 

new IloCplex(); var opl1 = 

new IloOplModel(model1, engine1); 
// Uncomment the next two lines if your model uses a data file. 
//var data1 = new IloOplDataSource("TwoEngines.dat"); 
//opl1.addDataSource(data1); opl1.generate(); 

if (engine1.solve()) 
{ writeln(
"Optimal objective (CPLEX): " + engine1.getObjValue()); 
} 

else 
{ writeln(
"infeasible"); 
} 
// Create a copy of the .mod file that has an explicit 'using CP;' directive. input = 

new IloOplInputFile(
"TwoEngines.mod"); output = 

new IloOplOutputFile(
"TwoEnginesCP.mod"); output.writeln(
"using CP;"); 

while (!input.eof) 
{ output.writeln(input.readline()); 
} output.close(); input.close(); var source2 = 

new IloOplModelSource(
"TwoEnginesCP.mod"); var model2 = 

new IloOplModelDefinition(source2); var engine2 = 

new IloCP(); var opl2 = 

new IloOplModel(model2, engine2); 
// Uncomment the next two lines if your model uses a data file. 
//var data2 = new IloOplDataSource("TwoEngines.dat"); 
//opl2.addDataSource(data2); opl2.generate(); 

if (engine2.solve()) 
{ writeln(
"Optimal objective (CP): " + engine2.getObjValue()); 
} 

else 
{ writeln(
"infeasible"); 
} 
}

Since this is pure OPL question please refer to the OPL Forum for further guidance.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

thanx Daniel , i think it works
thank you very much for your effort.
regards
#CPLEXOptimizers
#DecisionOptimization