Originally posted by: CuttingStock

Hi all,

i've got two questions for the Column Generation approach on the two-dimensional Cutting Stock Problem. I'm using ILOG OPL and OPL Script and I'm new to OPL Script. I've used the Tutorial in the Users Manual (Page 221) to write the code. My questions:

1.) Is there a possibility to solve the problem with one .mod file for each dimension? At the moment i have one .mod file for the hight and one .mod file for each width. With each width there is one row added, additionally to the columns that are added in each iteration. No matter what i try, i have the feeling, that i only get circular reference.

2.) In the Tutorial the Main problem is solved with integer variables. When i try and solve it with integers i get the error message: CPLEX Error 3019: Failure to solve MIP Problem. When i use "masterOpl.convertAllIntVars()" the problem can be solved. How can i solve it with integer variables?

Thanks in advance!
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