Marika Karbstein

As I said I cannot reproduce the error from the code snippet you shared. Please provide a minimal reproducible example.

Hi Sam, Could you try to remove the line \(\texttt{price.update()}\)? A model update should not be done in this situation.However, I can only reproduce an error \(\texttt{"AttributeError: Unable to...

Hi Anibal, Unfortunately, there is no output for the variable hint with Gurobi version 10. But if you can upgrade to version 11.0, you will see \(\texttt{Using variable hints}\) in the log output. ...

Hi Anibal, Setting variable attributes can be done with Gurobi persistent solver, see GurobiPersistent — Pyomo 6.7.1 documentation Here is a small Python example import pyomo.environ as pyo# Defin...

Hi Samuel, There is no automatic way in gurobipy. But you can update the model by changing the attribute values, for example, RHS,  Obj,  LB, or UB   using function Model.chgCoeff() to change a co...

Hi Jesse, In the log file, you can see that the best bound does not improve after the root node is solved; it stays at the value 6812335.05. Only incumbents improve the gap from 73% to 3%.You could...

Hi Timothy, It looks like you are mixing matrix-friendly and term-based modeling in Python.Did you try to use Model.addVars() instead of Model.addMVar() ? Best regards,Marika

Hi Matthias, The behavior you experience is probably due to parallel solves, which Tobias describes in more detail in this comment. Best regards,Marika

Please note that the Pi attribute is only available for linear programs. We discuss this in the Knowledge Base article How do I retrieve the (dual) Pi value for a MIP problem?

What environment variables did you check? Did you also check GRB_LICENSE_FILE? It looks like this environment variable points to the old version.