Alison Cozad

Gurobi has a number of parameters that affect the solution time for this model. It may be beneficial to try non-default values to see if you are able to improve performance. While it may be dauntin...

It sounds like you are on the right track with computing the IIS to help point you in the direction of the constraints that may be causing the infeasibility.  Did you get any useful information fro...

You are correct, there is an upper limit placed on \(y\).  According to the General Constraint documentation, For some of the supported functions, modest  values can lead to enormous  values (and ...

It looks like you have the foundation to do this with your binary variables that show when \(x_i\) is positive. Next, you can create big-M constraints that can turn on or turn off your equality con...

It sounds like you are relaxing your problem correctly. However, the root relaxation in Gurobi is more sophisticated than relaxing the integrality of a MIP. You can access this information by savin...

Mahshad,It sounds like Gurobi is finding the license that comes prepackaged with the Gurobi pip installer rather than 'Library/gurobi/gurobi.lic'.  Our pip installer includes a limited license that...

You are on the right track in creating a new variable, \(z\).  However, you will need to  Use the \(\texttt{.addVar()}\) method to create \(z_{ij}\) as a variable Use the \(\texttt{.addConstr()}\)...

Here are a couple of thoughts that may help performance: Tightening the ranges on your variables.  In nonconvex optimization, it good modeling practice to have tight bounds on all variables.  As Gu...

After reviewing with Han and our developers, we found that Han's quadratic constraint in the model is nonconvex, but very close to a convex one. The Gurobi Developers will look into how to improve ...

You can find some suggestions to speed up your model build here:  How do I speed up the time to build my model?