Originally posted by: YunYuan

Hi, I am new to CPLEX, and I have lots of problems setting up my model.

I want make a flexible job shop scheduling problem with MIP, and I want to make a decision variable Xijk to see if the j-th operation of job i is processed on machine k.

If yes, then Xijk=1.

But, the index j is dependent on job i since it's a flexible job shop problem.

That means, j will be 1,2,...,n[i].

I found that CPLEX cannot initialize array with different size(Please correct me if I am wrong with this idea), so Xijk can not be array type.

I tried to make Xijk into a tuple, is it possible? Or anything better than tuple type in this situation? Please help me. Thank you!

Hi

could

https://www.ibm.com/developerworks/community/forums/html/topic?id=67c2ccb8-7622-40b4-8cd5-4d55b4e9e899&ps=25

and

https://www.ibm.com/support/knowledgecenter/SSSA5P_12.7.0/ilog.odms.ide.help/OPL_Studio/opllanguser/topics/opl_languser_app_areas_LP_sparsity.html

help ?

regards