Sophie Wuyckens

I see. Well here is the thing, I have tried a model where I was trying to minimize a function \(f'\) directly representing a linear combination of binary variables associated with additional flow c...

Sure. Here is a link. Thank you for your help.

Hi Jaromil, I tried both solutions you proposed and it does not change anything, it still solves the LP and stops there. Using mipsol call back, it complains I don't use MIPNODE while using cbGetNo...

Hi Jaromil, Yes that's the thing. No nodes are displayed at all. The model finds an optimal solution and stops. Thank you for your follow up. Gurobi 9.5.0 (linux64) logging started Thu Jun  9 17:5...

Hi Jaromil, Marika, I don't have difficulties to include a callback. It actually enters the callback, what it does not is to enter the condition where == GRB.Callback.MIPNODE. Anyways, here is my c...

Hi Jaromil, Thank you very much. Very informative, exactly what I needed to know. Regards, Sophie

Hi Maliheh, I saw this solution but the problem is I want to only access specific variables by name and not by the variable object.I tried the following but I still get an error: names_to_retrieve ...

Hi Maliheh, Quick question, I wanted to know the value of some of my variables during the optimization using a callback function (where=MIPSOL). However, I get an error during the callback when I w...

Hi Eli, If you allow me, I have two remaining  questions regarding my model stated above. Firstly, I generated an initial feasible solution from a reduced problem and I want to feed the MIP start o...

I was not familiar with this min-max constraint trick in Gurobi but now it is all clear thank you. I tried and it works. Indeed I will have to add other objectives to the overall objective function...