Ebru Angun

I 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 ...

Hi 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...

Hi 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...

The 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...

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...

I 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...