Marcus Garvie
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Latest activity by Marcus Garvie
Marcus Garvie commented,
Thank you Jaromił. Was Gurobi able to solve these smaller models in a decent amount of time? Yes. For a model that is very similar, Gurobi solved it in about a minute! Another related model (but ...

Marcus Garvie created a post,
Behaviour of IntInf in the branchandcut tree search log
AnsweredHi everyone, I've been running a very tough pure binary LP problem with zero objective function in Gurobi. I'm happy to wait several months if that's what it takes to get a solution. I have experim...

Marcus Garvie commented,
Thank you Matthias, that is very helpful. So as I explore the effect of different parameter sets I know what to look for. Best, Marcus.

Marcus Garvie commented,
Hi Matthias, we didn't deliberately construct a hard model. After a years' worth of work we managed to convert the Eternity puzzle into an LP problem. This is a notoriously difficult tiling problem...

Marcus Garvie commented,
Hi Mathias, thank you for your comments. Yes I do know that the problem I am trying to solve was deliberately constructed to be difficult. When you suggest disabling cutting planes do you mean set ...

Marcus Garvie created a post,
Interpreting the log file for the branchandcut tree search
AnsweredHi everyone, I've been trying to solve a very large pure binary LP problem with no ('constant') objective function. After much experimentation I found parameters that vastly decreased the solution ...

Marcus Garvie commented,
Hi Jaromił, just an update. With smaller model I played around with the parameters quite a bit and also tried tuning. With your help I found the following parameter choices gave the greatest improv...

Marcus Garvie commented,
Hi Jaromił, gosh, there is a lot to try. I do have a smaller problem but it seems to be solved vey quickly and doesn't suffer from the same delays at the root node. I did try tuning the smaller mod...

Marcus Garvie commented,
Hi Jaromił, thank you for your reply. I'm not very knowledgeable about Gurobi so I was wondering if you could expand a little on some possible values for the parameters you mention. First a little ...

Marcus Garvie created a post,
Unexpected improvements to an LP file with zero objective function
AnsweredHi everyone, I've been trying to solve a very large undetermined binary linear system in LP format. So the objective function is zero (or constant). Thus I'm really just looking for a feasible solu...