Originally posted by: gregman

Dear Cplex-Community,

I am currently struggling with the following problem:

given a set p = {1,2}

given a set of ranges W_i

Since W_i is dependent on p, W_2 is supposed to be 2..6, W_1=1..6 and both are dependent on p, respectively. It is not possible to create 2 separate simple ranges. 

-Is it possible to create a set of ranges W_i in Cplex with different starting and ending points?

-Furthermore, could you give me the syntax for a max() formula inside a sum?

Example: sum (a in 1..max(b,c) ).

Thanks a lot,

Greg

It sounds like you want to do this in OPL? If that is correct then you should ask the question on the OPL Forum. There you will find the OPL experts.

I am not an OPL expert but if you could sets instead of ranges, this would work (initialization of sets taken from here):

{int} p = { 1, 2 };
{int} W[i in p] = {k | k in 1..6: k >= i};
 
minimize 0;
subject to {}
main {
  for (var i in thisOplModel.p) {
    writeln(i + ": " + thisOplModel.W[i]);
  }   
}

In your question about max() inside a sum, it is not clear whether b and c are decision variables or data.