Originally posted by: StefanRopke

I have some students working with CPLEX in C#, through the .Net interface. They would like to get the best bound (lower bound for a minimization problem) for their MIP when CPLEX terminates because of a time limit.

In C++/Concert I know you can get the best bound using the getBestObjValue() method on the CPLEX object, but that method does not seem to exists in the .Net interface. So my question is simply: what is the C#/.net equivalent of getBestObjValue()?

Best regards,
Stefan
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Originally posted by: SystemAdmin

I don't use C#/.NET, so I'm guessing here, but if you poke around with the GetQuality method, you should be able to recover the objective gap (ObjGap is a field of Cplex.QualityType).

/Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
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Originally posted by: StefanRopke

Thanks Paul, reading the CPLEX manual this seems like a solution to our problem. We'll try it out!

Best regards,
Stefan
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#DecisionOptimization

Originally posted by: GuangFeng

How about property BestObjValue? I have not verified it, but I think most, if not all, getYYY() methods should have corresponding YYY properties in .NET interface.
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Originally posted by: SystemAdmin

The BestObjValue property does indeed exist and reading it is how you get the dual bound in C#.
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Originally posted by: StefanRopke

Thanks for all the answers. My students used the BestObjValue property and it works perfectly!

Best regards,
Stefan
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#DecisionOptimization