Mario Ruthmair

Hi John, I saw your previous post but it involves only your code, not the problem description itself. From the code it is already difficult to extract the mathematical model, and it is even more di...

Hi Michel, Hmm, it seems to be related to the way you are using Gurobi in your C++ application. Could you try to build a minimal working example based on your application and post the source code h...

Hi Michel, Thanks, I will try to reproduce it with your information! Can you try to run the Gurobi command line on your local NixOS with an included model, just to cross out the C++ API: gurobi_cl ...

Hi John, Can you please give a detailed description of your vehicle routing/platooning problem?Synchronization aspects are not easy to model in VRPs, so it is important to know the details before b...

Hi Soumya, Can you please be a bit more specific?What do you mean with callback- and non-callback version?What exactly are you doing in the callback?What do you mean with wrong upper bound value? B...

Hi Kechen, What exactly is the error message you get? In addVar() you use NULL for a string argument (name). Since the name parameter is optional, you can just skip it. Best regards,Mario

Hi Michel, This is interesting, I cannot reproduce your issue on my side, both with Gurobi 9.1.2 and 9.5.0, the thread count message at the end states the number of threads that has been set with p...

Hi Michel, It seems that this is somehow related to the docker environment. How did you limit the number of CPUs within a container? There are a few docker parameters that can do this, see here. Ha...

Hi Shuk, How is this related to Gurobi? Are you trying to create variables for each tuple (tau,q)? Creating the list of feasible tuples can be done, e.g., with Python generator expressions: Tpt = [...

Hi Adil, You could use matrix variables for modeling the TSP, but using usual 2D variable arrays might be more intuitive, e.g., as sketched in the following piece of code, modeling the objective an...