not finding glable optimum with an SOS2 formulation solving using CBC
|Reported by:||ylee77||Owned by:|
I am confronting a problem that the solution obtained from CBC doesn't coincide with what I obtained from CPLEX. I actually tried two ways to code up the SOS2 formulation and they both return same values, with a claim that the search is complete and the solution is proven optimum. Yet I can see the solution is not optimum and is different from what CPLEX get. I wonder whether there is some internal problem inside the branch-and-bound. Thanks a lot.
- the problem formulation
- the input data set
- a piece of code that includes the function " PfofModel_OptimizeMaxParticipation" which I coded the SOS2 formulation and using branch and bound to solve it.