Originally posted by: SystemAdmin

Hello every body, hope all is well.

I am implementing a branch and cut algorithm for solving a mixed-integer program. I'm going to add some constraints which I create them from an special set. I want to use CPLEX tree instead of implementing my own tree but I need to add the constraints which I create them form an special set in each node. Can I do that? Is there any body who has done that before? I appreciate all your helps.

Bests,
Esmaeel
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Originally posted by: Laci Ladanyi

You need to use that usercut and/or lazyconstraint callbacks. Look at the admipex5.c example (or the corresponding examples in the other supported APIs), and you can find the documentation at http://pic.dhe.ibm.com/infocenter/cosinfoc/v12r4/index.jsp.

--Laci
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Originally posted by: SystemAdmin

If you need to add the constraints at each node then using a branch callback is another option. That might be a little simpler than a user cut or lazy constraint callback -- provided that adding the constraints at each node is the correct thing to do.
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Originally posted by: Esmaeel

Thanks for your answer. I'll try it and see what will happen.
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