Unbounded ray of an infeasible LP problem (Python)

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Canqi Yao

2021年01月21日 08:39

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

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:01 編集済み

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  Matthias Miltenberger

  • Gurobi Staff

  2021年01月21日 11:27

  Hi Canqi,

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

  Cheers
  Matthias

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  Thomas Opfer

  2021年01月22日 23:02

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  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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