Matthias Miltenberger

Gurobi Staff Gurobi Staff

Gurobi Optimization Support Manager - Berlin, Germany

  • Total activity 850
  • Last activity
  • Member since
  • Following 0 users
  • Followed by 0 users
  • Votes 36
  • Subscriptions 368

Activity overview

Latest activity by Matthias Miltenberger
  • Matthias Miltenberger commented,

    Hi Dominik! We need more information to work on this, for example, log files, model files, or anything else to reproduce this issue. This is not supposed to happen, of course, and is most likely a ...

  • Matthias Miltenberger commented,

    Hi Mengyuan, For this use case, you should either use a floating academic site license, that is, have your university set up a Gurobi token server that can be reached from your cluster. The other s...

  • Matthias Miltenberger commented,

    You might also want to check out this article about strict inequalities: Why doesn't Gurobi support strict inequality constraints like x < a?

  • Matthias Miltenberger commented,

    Hi Putri! Please review the two links to addConstr and addConstrs that I shared above. You have to use the 's' variant if you want to use Python list comprehensions inside the call. The addConstr m...

  • Matthias Miltenberger commented,

    Hi Putri, Please note that in math programming there are no strict inequalities. You need to model such restrictions by adding a small tolerance, e.g. mdl.addConstr(x[i,k] + eps <= d[k]) You should...

  • Matthias Miltenberger commented,

    Hi Jingfeng, If you solve the quadratic constraint for \(\texttt{z}\), you see that this is in fact infeasible with the condition of \(\texttt{z} \geq -1\): \[\begin{aligned}- r_1^2 + r_2^2 - 6.558...

  • Matthias Miltenberger commented,

    One more piece of advice, Yu: You can use LaTeX directly in our Community Forum as explained here: Posting to the Community Forum This is a lot less work than copy-pasting mathematical notation as ...

  • Matthias Miltenberger commented,

    Thanks for the additional information, Robert! I also noticed the different parameters being used in AMPL but wanted to make sure that at least the model that is being solved is identical for both ...

  • Matthias Miltenberger commented,

    Hi Jonas(z) :-) This should be possible in C++ as well by reallocating the variables array and filling up the new slots with newly created variables. Or you set up the variable array large enough i...

  • Matthias Miltenberger commented,

    Hi Dávid, Please make sure that the file path does not contain any non-ASCII characters - this can easily lead to errors when trying to parse the path. I know, it's 2022 and we should expect a wide...