Originally posted by: AMM1

good morning , 

i have question regarding modeling vrpmtw using cp.

My code is working but i have problem in  :  

That I  have 48instances to be run and each one have different number of time windows.

so each problem has its own model. so for now i have 48 model and 48 data file

i put the time windows in tuple in the data file so i should define the columns in this tuple in the model itself and this was the reson why iam having 48 models  .

**how can i make general model for all of the problems so that the number of time windows would be as variable and

**how can i put the time windows for each client in the  data file? 

Originally posted by: Petr Vilím

Hello,

I assume that you're using OPL since you mention data files.

It is hard to give you exact advice without knowing more of your model. However I recommend to have a look at the OPL examples in directory opl/examples/opl, most likely one of the examples contains something similar to what you need. My guess is something like this in the .mod file:

using CP;

tuple Task {
  int start;    // Minimum start time
  int end;      // Maximum end time
  int duration;
};

{Task} Tasks = ...;

dvar interval itvs[t in Tasks] in t.start..t.end size t.duration;

And in the data file:

Tasks = {
  < 1, 10, 2 >,
  < 5, 20, 5 >,
  < 7, 30, 1 >
};

Best regards, Petr