Originally posted by: AndyHam

Dear IBM,
I am trying to add an OplDataElement. When I tried a single integer variable for OplDataElement, it worked great. But, when I tried a tuple, it generates the following error: "Cannot use type string for …". Would you please see if how we can make the following illustration code work?

//Test_Sub.mod

tuple t_A2B {

  key int a;

  key int b;

} {t_A2B} A2B=...;

dexpr int Makespan  = sum(ab in A2B) ab.a*ab.b;

minimize Makespan;

subject to {};

//main.mod

main {

  var source = new IloOplModelSource("Test_Sub.mod");

  var def = new IloOplModelDefinition(source);

  var opl = new IloOplModel(def,cplex);

  var data= new IloOplDataElements();

  data.A2B= "{<1 1> <2 4>}";

  opl.addDataSource(data);  

  opl.generate();

  cplex.solve(); 

}

Hi,

I would rather write

 tuple t_A2B {

  key int a;

  key int b;

} {t_A2B} s;
 
 
 main {

  var source = new IloOplModelSource("Test_Sub.mod");

  var def = new IloOplModelDefinition(source);

  var opl = new IloOplModel(def,cplex);

  var data= new IloOplDataElements();

  //data.A2B= "{<1 1> <2 4>}";
  data.A2B=thisOplModel.s;
data.A2B.add(1,1);
data.A2B.add(2,4);

  opl.addDataSource(data);  

  opl.generate();

  cplex.solve();
  opl.postProcess();

}

and you could read that at

https://www.ibm.com/developerworks/community/forums/html/threadTopic?id=5b68f185-2132-4296-9ea4-a4d128937d65&ps=25

which is part of

https://www.linkedin.com/pulse/how-opl-alex-fleischer/

regards

Originally posted by: AndyHam

Thanks! You don't know how many times you saved me from the project failure. I am currently working with an industry to deploy a real-time scheduling system based on CP optimizer.