Tobias Achterberg
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Latest activity by Tobias Achterberg
Tobias Achterberg commented,
Official comment You are adding variables with model.addVar() from within your callback? This just cannot work. What you have in your hand as a user is the original user model. But the branchandcut is performend ...

Tobias Achterberg commented,
This should get fixed with our new Gurobi 10.0 release, which is scheduled for first half of November 2022.

Tobias Achterberg commented,
This is a delicate issue. We only promise that we will be able to detect the following two cases as convex: 1. x^T Q x <= d with PSD matrix Q2. sum xj²  y² <= 0 with y >= 0 But Gurobi will also be...

Tobias Achterberg commented,
You need to add each of your constraints with m.addConstr().

Tobias Achterberg commented,
In your formulation, I think that you always need to use (1  bi) for all the bigM constraints as you have formulated them.

Tobias Achterberg commented,
I think that your bigM constraints are wrong. For example, b1=0 will force I[v][i] <= 120*SOC_avg[v][i] due to the first bigM constraint. This is not what you want. You only want to force constra...

Tobias Achterberg commented,
For example, say you have four different regions based on the relationship of x and y in which you have different objective functions. Then you need four binary variables to indicate in which regio...

Tobias Achterberg commented,
The log file looks okay. It seems pretty difficult to find a feasible solution for your model. What you see in the table is the output of the branchandbound tree search. The algorithm successivel...

Tobias Achterberg commented,
This is actually not a bug. It is due to the large (actually, infinite) domains of your variables and the consequences that this has for the piecewise linear approximation that we use for the log ...

Tobias Achterberg commented,
This looks like a bug. Thanks for reporting! I will investigate and check what is going on. Tobias