Silke Horn
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Latest activity by Silke Horn
Silke Horn commented,
I added another (less general) approach to your other post here.

Silke Horn commented,
Hi, You could add some auxiliary binary variables; some that are 1 if and only if X > 0 and some others that are 1 if and only if X < 1. B0 = m.addVars(M, N, vtype=GRB.BINARY)B1 = m.addVars(M, N, v...

Silke Horn commented,
Hi Prasanna, Counting the total number of feasible solutions is a very difficult problem and this number can easily get gigantic. Gurobi cannot do this since it is not an optimization problem. You ...

Silke Horn commented,
Hi David, The angles should always be in radians. Best regardsSilke

Silke Horn commented,
Hi, What are the types of c and s? Are they scalars or decision variables? If they are decision variables: One cannot use a model's decision variables in ifconditions while building the model (sin...

Silke Horn commented,
Hi, You are right that Gurobi currently does not provide any SDP algorithms. Our development team is considering this feature, but we cannot make any promises. Have you looked at the SDP plugin of ...

Silke Horn commented,
Hi, Thanks for posting your log. The model is not extremely big and the numerics seems all right. From the log, you can see that presolve and the root relaxation are quite fast, but then Gurobi str...

Silke Horn commented,
Sometimes models are so hard that Gurobi cannot find any solution within 1 hour. How big is the model and where is Gurobi stuck? Could you post your log here?

Silke Horn commented,
We have assisted you in a support ticket, but I'll also post the gist of the answer here to help other users: We have dropped support for unencrypted HTTP connections to the license server for secu...

Silke Horn commented,
Hi, In Gurobi, variables don't have a default value. If there are multiple optimal solutions (for example by choosing different values for variables that do not participate in any constraint or the...