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Forum migration: please go to the Data Science community

The Decision Optimization group in the Data Science community is now live! Please join us there! Only the content from more than 4 months ago was migrated so far, but the newer content follows. This forum will very soon be turned read-only, and will disappear shortly after the migration...


Discussion Post
No change in the best integer and best bound

Originally posted by: 88Simon88 Hello, I am solving a MIP problem. After 5 to 10 minutes, the gap goes down to 2.19% and remains at the same level for hours. There is almost no change in the best bound and best integer. What can I do? Thanks in advance for your help. ...



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how to writing cplex code

Originally posted by: Kylie gp Dear Everyone, If my project wants to define that task 1 and task 2 have to work in same machine, task 3 and task 4 have to work in same machine, task 5 and task 6 have to work in same machine, task 7 and task 8 have to work in same machine, task 9...



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Re: If else for binary decision variable

Originally posted by: Blestoy I have taken a close look at the tutorial and understand what they are doing however in my case it is a little bit different. I was wondering if the following constraint is the reason why the following works: forall(i in 2..p, s in S) sum(j in...


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Re: If else for binary decision variable

Originally posted by: Blestoy Thank you so much! I think this will definitely help me.


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Re: If else for binary decision variable

Hi, do not hesitate to read https://www.ibm.com/support/knowledgecenter/SSSA5P 12.8.0/ilog.odms.ide.help/OPL Studio/usroplide/topics/opl ide relax.html regards


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Re: Using concatenation to join tuples in a set

Hi, you could do that with scripting but I would recommend to use sets instead of strings and then tuple def (string strA; (string) strB;); (def) data = ( <"cat", ("A")>, <"cat", ("B")>, <"cat", ("C")>, <"cat", ("A","B")>...