Originally posted by: adsi

hello,

i am currently working on establishing a negotiation between a buyer and a supplier on basis of the multi-capacitated lot sizing problem, implemented in cplex.

in a small scenario, the buyer is producing items 1-4, whereas the supplier is responsible for supplying items 5-7.

what i want to do is create three sets:

{int} buyeroperations

{int} supplieroperations

{int} operations = buyerops union supplierops

my question now, as i am fairly new to cplex/opl, is how to initialize the sets with the respective items in order to work with them in my models.

i guess i could initialize them internally by means of:

{int} buyeroperations = asSet(1..4) 

{int} supplieroperations = asSet(5..7) 

{int} operations = buyeroperations union supplieroperations

Hi,

let me give you an example:

{int} buyeroperations = asSet(1..4) ;

{int} supplieroperations = asSet(5..7) ;

{int} operations = buyeroperations union supplieroperations;

execute
{
  buyeroperations.add(10);
  supplieroperations.remove(6);
 writeln(operations);
}

gives

 {1 2 3 4 10 5 7}

regards

Alex Fleischer

Originally posted by: adsi

hey alex, 

thanks for your reply.

in other words,my approach was right?

Let's assume i have a capacity constraint e.g.:

//capacity constraint

for all( j in buyeroperations, t in periods)

      "constraint";

what i want to achieve is that cplex only applies the constraint to buyeroperations (operations/items 1-4)!

is that to be realized with my approach?

thanks for the input!

Hi

forall( j in buyeroperations, t in periods)

will apply the constraints for all  buyeroperations and all t in periods

regards