Jaromił Najman
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Recent activity by Jaromił Najman
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 time because Gurobi "is not rea...

None of the models reaches an ordering time of ~2500s as seen above. Why does it often take so much longer to order when using the automatic value for BarOrder (= 1) than selecting BarOrder = 0 o...

Do you have an idea what could explain this behavior? Could you also show the first lines of the log files? In particular the finger print values. If the finger print values differ, then somethin...

Hi Jacob, once again thanks for your fast and comprehensive help! As always a pleasure to talk to you! Thank you for the kind words. Could you explain a bit (or hint me at an explanation) what t...

Hi Jacob, Even small changes to a model can change the optimization path significantly. EDIT: I reran it, and now the ordering times switched (model B < model A), so is the ordering time in fact ...

The Bellman equation describes a dynamic decision problem in the optimal control theory. It cannot be directly translated into a mathematical optimization model unless you define it only for a spec...

Thank you for the log snippet. You can see 2 quite serious warnings. Warning: Thread count (16) is larger than processor count (8) Reduce the value of the Threads parameter to improve perf...

Hi Cai, I wonder what is the maximum limit of the matrix Q, is it because my matrix Q is too big? The maximum limit of nonzeros for matrix Q is currently 2 billion (\(2\cdot 10^9\)). If you want ...

Hi Agustino, This kind of function and constraints are thoroughly discussed in the posts Nested sum using quicksum() Nested quicksum function? Nested quicksum Difference between nested quicksum an...

Hi Fabio, Good to hear that you are making progress. Just a question: Is it more efficient or correct to use 0.5 instead of 1, considering that all variables are integers? It is not more efficien...