Jacob Mannhardt
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Activity overview
Latest activity by Jacob Mannhardt-
Jacob Mannhardt commented,
Thanks for your hints and tips! So if I understand correctly, selecting either 0 or 1 is fast, because Gurobi "knows what to do", whereas selecting the automatic selection takes so much additional ...
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Jacob Mannhardt commented,
You are right, the fingerprints are different, and now that you mention that, we use a time series aggregation scheme, so the models are not 100% identical. The aggregation works well enough, so th...
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Jacob Mannhardt commented,
Dear Jaromił, Thanks for the explanations, I will look into that. Turns out, the ordering times for the same model with the same parameters and the same settings vary significantly. I started four ...
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Jacob Mannhardt commented,
Hi Jaromił, once again thanks for your fast and comprehensive help! As always a pleasure to talk to you! Interestingly, it is mostly but not necessarily always model A < model B, however, different...
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Jacob Mannhardt created a post,
Varying Ordering Time for similar models
AnsweredHey everybody, I have two models that are super similar, model A and model B. In fact, they only differ in one constraint. The matrix dimensions are similar as well:model A: Presolved: 7054320 rows...
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Jacob Mannhardt commented,
Hi David,thanks a lot for your quick reply. Jaromił has also already recommended going to v10, however I am running my optimizations on a central computation cluster, where it is not super easy to ...
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Jacob Mannhardt created a post,
Suboptimal termination and unbounded or infeasible solution
AnsweredHey all, We use the barrier algorithm without Crossover for a relatively large model (see log below). I know that the ranges aren't great, but unfortunately the parameters must be in consistent phy...
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Jacob Mannhardt commented,
Hi Jaromił, thanks again for your continued help! I will try that! Best wishes and many thanksJacob
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Jacob Mannhardt commented,
Hi Jaromił, thanks for your quick reply! The parameter settings grew historically, but I am always looking for a better configuration, so your help is always much appreciated! I used BarHomogeneou...
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Jacob Mannhardt commented,
Hey Jaromił, to pick up the thread here, I observe exactly the same behavior: The root simplex gets stuck after the crossover after a barrier solve. Set parameter BarHomogeneous to value 1Set pa...