Originally posted by: G.B.

Hello, I have .mod where I declare an array of Tuples. After the Linear Program is solved, I want to populate this array with a script. I have tried several options, but I keep getting an error.

What is the best way of populating an array of Tuples with an OPL script?

My array of Tuple is:

tuple TPlan {
  int start;
  int end;
};
TPlan plan [session][1..horizon.nbPeriods];

My Variables:

dvar boolean Start[session][Rangeperiods];
dvar boolean End[session][Rangeperiods];

My current script (giving an error):

execute UPDATE_RESULTS {
  for(var s in session) {
    for (var p in Rangeperiods) {
     plan[s][p].add(Start[s][p], End[s][p]);
    }
  }
}

Hi

range session =1..2;
range Rangeperiods=1..2;

 tuple TPlan {
  int start;
  int end;
};
TPlan plan [session][1..2];

 

execute UPDATE_RESULTS {
  for(var s in session) {
    for (var p in Rangeperiods) {
     plan[s][p].start=1;
     plan[s][p].end=2;
    }
  }
}

works

add would work if plan was a set, but is is a tuple

regards

Originally posted by: G.B.

Thank you Alex for your help. I tried your solution and it worked. I also tried changing the type to a set and using add, and it worked too.

Do you know what is the "best" type to use in this case (tuple or set) - are there any pros or cons of using one of them?

Hi,

in your case you seem to have 1 and only 1 plan for each session and each period so tuple are better here.

If instead, you had had sometimes 1, sometimes 0 and sometimes 7 plans then sets would have been better

regards