Maliheh Aramon

Thanks for your answer. About question 3, I guess that a QP relaxation just could take excessive long time in the presence of numerical issues, in which case the node processing would be terminate...

Regarding question 2) No, when solving an MIQP model, either you should use the barrier for all QP relaxations including root and node via setting Method=2 and NodeMethod=2, or all the QP relaxatio...

Hi Tanmoy,  The Gurobi Optimizer uses an LP-based Branch-and-Bound (B&B) algorithm to solve a MIP. The B&B algorithm has multiple building blocks including presolve, relaxation, node selection, bra...

Hi Abde,  To fix the variable \(\texttt{S2[s,t]}\) to the value of the variable \(\texttt{S1[s,t]}\) already optimized, you can use one of the approaches below: Via setting the lower and upper bou...

Hi Qiuyan,  It is not possible to use Gurobi variable objects in if-clauses because there is no value associated with them to be used in comparison. The reason for the error you see is well-explain...

Hi Gabriel,  We do not support asynchronous optimization in Python because the gurobipy module is not thread-safe. Therefore, there is no method similar to the GRBModel.optimizeasync() method of C+...

In the log we have the messages below implying that Gurobi processes the start solution. User MIP start did not produce a new incumbent solution...Another try with MIP start Please see the document...

Yes, your understanding is correct. The R and MATLAB APIs are matrix-oriented where decision variables are defined as a vector and there should be a coefficient for each variable in the objective v...

Hi Aleksandrs,  All Gurobi functional examples are available in R API as well. Please see the R Examples list. There are three examples of diet.R, facility.R, and workforce1.R that you would find u...

Hi,  Please have a look at the script attached assuming that you would like to implement the constraint below with \(w_1\), \(w_2\), and \(d_{12}\) being decision variables: \[\ln(w_1) - \ln(w_2) +...