Daniele Patria

Dear Matthias,I've been investigating the problem and I finally understood what was happening.A quadratic equality constraint, as you suggested, always takes to a non-convex feasible set (with appr...

Thanks for your answer Matthias.I am not really used to ask for help on communities so I apology for any inconvenient that I am causing. I understood how it should be done now. I'll see if it is th...

Hi Matthias, one thing I forgot to say: the model has only integer variables.The algorithm I've implemented is made of more than 1 python script. I'll try to do my best posting below the significan...

What do you mean by "reproducible" here?At this point I think I will ask for permission for posting here all the4 needed files, but I don't know how to do it actually. The constraint is just a quad...

Additional information: when using an inequality constraint, I am not getting the "nonconvex" error but the non-positive-semidefinite one, that follows gurobipy.GurobiError: Q matrix is not positiv...

Thanks for your reply Matthias.At this point I am a bit confused: I am running the algorithm I've implemented (from which the piece of code I posted is taken) with different datasets. All the attem...

Thanks for your answer Matthias.My explanation wasn't the best... I'll try yo make it simpler so that it's clearer and easier for me to explain: I have a quadratic expression made of only non-nega...

Dear Jaromił,thanks for your answer. I managed to solve my problem and now the code works fine.By the way I am still curious about why it does work that way when adding linear constraints... It wou...