Originally posted by: titino

Hello! I created an OPL model but I have a problem because it does not give me any solution but there aren't errors. I have a vector representing the demand values for each period t, which can have positive or zero values . The model will be launched only on the positive values and in particular from the third positive value. 
For the second positive value I calculate  Z, R, D and tot which are necessary for the resolution of the model from the third positive value. Based on the output values of the model each time you launch the next. Because the code does not work? What could be a possible solution? I attach below the model I created in txt files.

The phrase "does not give me any solution" is ambiguous. Does the model terminate with an infeasible status (saying that there is no solution), or does it reach the time limit (or some other limit) without finding an incumbent (but also without proving infeasibility)?

Originally posted by: titino

Cplex.getCplexStatus() return 3, therefore model is proved infeasible.

If you know the model is feasible, presumably you know (or can easily find) a feasible solution. It does not have to be good, just feasible. Fix all the variables to the known feasible values, then obtain a minimal infeasible subset of the constraints. Assuming your solution really is feasible, one or more of those constraints contains an error.