Unbounded ray of an infeasible LP problem (Python)

Answered

Canqi Yao

• January 21, 2021 08:39

Can you tell me the API for retrieving the unbounded ray for an infeasible LP problem ?

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  Matthias Miltenberger

  Gurobi Staff

  • January 21, 2021 11:27

  Hi Canqi,

  You can query the unbounded ray using the variable attribute UnbdRay.

  Cheers
  Matthias

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  Thomas Opfer

  • January 22, 2021 23:02

  

  

  The question was about infeasible LPs. So I guess, we are looking for the unbounded ray of the dual (if the dual is unbounded and not infeasible).

  Don't we have to use FarkasDual to query it?

  I don't know what FarkasDual returns when both primal and dual are infeasible, which does not happen too often (there is one example in the netlib).

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