Hongyu Zhang
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Recent activity by Hongyu Zhang-
Getting "DUAL_INFEASIBLE" when solving a very simple linear programming problem.
AnsweredHello! I am solving a simple LP problem with dual simplex and presolve. I get the model is unbounded but I couldn't see why such a model is unbounded, can it relates to numerical issues? Please hel...
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Why Barrier report numerical trouble encountered even the ranges are not large?
OngoingHello! I am using Barrier with persovle on to solve an LP. So I rescaled the model to make the matrix and objective range relatively small. And this model is solved with dual simplex without an iss...
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How Gurobi solves a optimisation problem that doesn't have an objective?
AnsweredHello! I am solving an LP optimisation problem and wondering how Gurobi solves a problem without an objective? For example, an LP problem with some inequality constraints and some equality constra...
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Retrieve constraints matrix from Gurobi or MOI or JuMP in Julia
AnsweredHello! I want to retrieve an LP model in matrix form from Gurobi. I am using package JuMP in Julia. I can print all the constraints using MathOptInterface but not in matrix form. I have no idea h...