Eli Towle

Hi Fabien, Can you please post your callback code? Thanks, Eli

Hi Sab, You can use the min_() general constraint helper function to model minimums. But in your case, it seems much better to just break each of these constraints into two separate constraints. Fo...

Hi May, You can use Gurobi 9.x with Python 2.7. For more information about supported Python versions, see here and here. Note that Python 2.7 recently reached its end-of-life and is no longer activ...

Hi Ashraf, Quadratic programs are solved using either barrier or simplex. There are some resources suggested in this community post that you might find useful. Constructing the model should be a lo...

Hi Ashraf, You define the \( \texttt{s} \) dictionary using the distances DataFrame instead of the shipments DataFrame: s = {(i,j): d[i][j] for i in MP for j in Fac} This explains why the first app...

Hi Lahlou, Great, thanks for the update. Yes, this will be fixed in the next major release. Eli

Hi Xiangfeng, Right now, that constraint is structured for the implication \( \texttt{status[i]} = 1 \implies f_i(x) \geq 0.9 \), where \( f_i(x) \) represents the quantity of samples assigned to c...

Hi Xiangfeng, I added an element to your \( \texttt{speed} \) and \( \texttt{bw} \) lists. They each contain four elements, but \( \texttt{num_of_clients = 5} \). speed = [0.13, 0.10, 0.15, 0.20, 0...

Hi Lahlou, There is currently an issue with the RunTime attribute resetting after you (e.g.) write a solution file or update the model. Could you try querying the runtime immediately after optimizi...

Hi Xiangfeng, Do you have a few lines of code that show how the data ( \(\texttt{speed}\), \(\texttt{bw}\), etc.) is defined for a small instance of the problem? Thanks, Eli