Ebru Angun
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Recent activity by Ebru Angun-
Is it possible to have constraints such as z^1.5 <= v in the model
AnsweredI have a problem with constraints: z^1.5 <= v. It is possible to write power constraints as z^1.5 = v. But, is it possible to have constraints such as z^1.5 <= v, where z, v >=0? Is it possible to ...
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Setting the number of threads
AnsweredHi to all, My question is a general one on setting the number of threads when solving a MIP which takes a very very long time to finish. First I set the number of threads to 24, which ended up exha...
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SOS Type I
AnsweredHi to all, My question is that there are two variables, say z and s, such that 0 <= z <= 1 and s >= 0, and they define to form a special ordered set of type I (SOS Type I). How does Gurobi handle t...
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callback to terminate after a number of same incumbent solution
AnsweredThe problem is solved through column generation, and the subproblem is an MILP. I think that it is a better idea not to solve this MILP until 0.01% mipgap is observed at every iteration. Hence, I w...
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Using GRBterminate after a number of same incumbent solution
Hi all, I wrote a callback function which is executed at GRB_CB_MIP. The aims of this callback are: 1- if for the last 50 iterations, the best incumbent solution is not changed, then terminate solv...
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Speed up gurobi to solve an milp
AnsweredI am working with an milp with 58 binary variables, 70 continuous free variables, and 590 nonnegative continuous variables. There are also 1212 constraints. It took Gurobi about 12000 seconds to so...