Originally posted by: kilos

Hi all,

I was wondering if anyone could help me with adding cuts that involve new variables (using C++)? I have tried addUserCuts() and cutCallback, both of which cannot handle this issue and will throw an exception. I have searched the forum but didn't see anything similar posts. Any idea on how to circumvent this situation?

Many thanks!
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Originally posted by: amindehghanian

I don't know exactly what you are implementing. But, if you want to add a new variable in branch and cut tree, AFAIK, it is impossible in CPLEX.
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Originally posted by: SystemAdmin

In a callback you can definitely not create new variables.
If you add the cuts before you invoke solve() then it may help to explicitly IloModel::add() the variables before you start the solve. Or include the variables in some dummy constraints like

model.add(x.getLB() <= x);

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Originally posted by: kilos

Thanks Daniel and amindehghanian, I think I'll take a look at my model again..
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