Originally posted by: ouss1

Hello,

I am working in a job shop scheduling problem.

I had found a problem in declaring a set.

For more details, I have N jobs and for each job I have concerned machines (not necessary the same, and not necessary the same sequence}

you find here a sample example :

I have 3 jobs and 2 machines. The first job has this sequence of machine : M1 then M2. The second job is treated in a single machine M2. Finally, the third job has this sequence (on machines): M2 then M1.

How can I define this problem in the file .mod and in the file .dat.

Can you give me an example (example of  a constraint) when using a set.

Thank you in advance,

Best regards 

You may have better luck posting this in the OPL forum.