Matthias Miltenberger

Hi Angus, One easy trick to access your variables inside the callback is to just add them as members to the model, as it is done in the callback example that comes with Gurobi:     model._vars = x...

Hi Jennifer, This is a hard problem! You are using concurrent optimization for the root node relaxation, so primal simplex, dual simplex and barrier are running in parallel. Apparently, barrier is ...

Hi Hans, InputFile is a command-line only parameter and cannot be used in gurobi.env. Best regards,Matthias

Dear Patrick, You are correct in assuming that the license may not be released after the environment is disposed of if there is a model that is still active. You should always dispose of all models...

Hi Santanu, Can you please share that log file with us? We may find something in there to help you with your problem. Thanks,Matthias

Hi! You could try to limit the number of cuts that are generated in the root node since they seem to cost a lot of time. You could try to use MIPFocus=1 to hopefully find feasible solutions earlier...

Hi Michael, You need to have Gurobipy installed in the same environment that Spyder is using. Please have a look at this guide and try executing the commands in step 2 withing Spyder. This will ins...

Dear Zahra, Matrix coefficients in the range of 1e25 are surely going to cause numerical issues. Is there another way to model your constraints other than bigM? Maybe someone can help when you shar...

Short answer: No, you should never use brute force. The number of possibilities is growing exponentially with the number of decision variables. 20 binary variables already result in more than a mil...

Hi Theresa, Do you mind sharing log files of these runs? Please note that it's not always guaranteed to get a performance increase when using more cores. Often there are other limiting factors like...