Maliheh Aramon

Hi Lene, In general, we say that the barrier converges when the normalized duality gap and normalized complementary slackness are within the BarConvTol parameter value. However, the actual terminat...

Hi Pedro, Does a quadratic objective function affect the convexity of the model?Yes, a quadratic objective function is not necessarily convex. For instance, the quadratic objective \(x_1^2 - x_2 ^2...

Hi Miroslav,Gurobi does not currently support direct optimization of black-box functions. If relevant, you can use the Gurobi Machine Learning Package to embed a trained regression model within a g...

I am still struggling to understand what p and q really mean in your optimization problem. It is hard for me to comprehend your problem as an optimization problem. Just focusing on this constraint:...

Hi Huib, How should the constraints look like for the scenarios where p = 0 and/or q = 0?Do you want to model the constraints below?If p = 0, then q = 0 and r = 1If this is the case, you should add...

Hi Ramesh, Gurobi can directly solve ILPs, so there is no need to manually convert them to LPs. The underlying solution methodology for solving an ILP is called branch-and-bound which is an LP-base...

Hi Ignacio, The behavior you're observing can occur when the model is prone to numerical issues, as you alluded to. In such cases, the "optimal" solution obtained may not be of perfect quality. The...

Do you solve the model to optimality? The best bound solution at optimality is equal to the optimal solution. I am not sure why you need to look at the node solution at optimality. The best bound d...

Hi Giordano, The error happens because the function \(\texttt{bbsol}\) does not know what the variable \(\texttt{x}\) is. You need to pass the model variables as data to the callback function. See ...

Hi Moses, If the primal problem is a minimization model, the current best objective values and the current best objective bound queried via the MIPSOL callback will always show a non-increasing and...