Maliheh Aramon
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Activity overview
Latest activity by Maliheh Aramon-
Maliheh Aramon commented,
Your formulation of using auxiliary variables to translate your model into a form which can be implemented using gurobipy looks fine to me. how to determine if the output solution is correct. T...
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Maliheh Aramon commented,
Hi Tycho, Let us define upper bounds \(U_s\) and \(U_p\) for the number of ships and total number of pickups. You would need to use your problem knowledge to come up with a simple heuristic to f...
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Maliheh Aramon commented,
Hi Yali, You code snippet is not executable. The are random \(\texttt{return()}\) statements with the function definition being commented-out. As the warning message indicates, the linear part of ...
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Maliheh Aramon commented,
Please checkout the article How does presolve work?.
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Maliheh Aramon commented,
Hi Tycho, It is not possible to use Gurobi Var objects as indices because a Gurobi Var object does not have any value associated with it until the model is solved. To model the relationship as th...
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Maliheh Aramon commented,
Hi, Yes, the \(\texttt{quicksum}\) is a gurobipy global function and the \(\texttt{sum}\) is a python function. The \(\texttt{quicksum}\) is a version of the \(\texttt{sum}\) function and it is fa...
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Maliheh Aramon commented,
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...
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Maliheh Aramon commented,
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...
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Maliheh Aramon commented,
Hi, You can define an auxiliary variable \(z_{ik} = x_i \land x_k\, ~~ \forall i, k\). The logical And constraints can be implemented using the Model.addGenConstrAnd() method in Gurobi Python API....
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Maliheh Aramon commented,
Hi, You can use the BranchPriority attribute to define a branching priority for the subset of variables you are interested in. The variables with larger branching priority values will take priorit...