What is Gurobi's equivalent to SCIP's getBasisStatus method?

Ongoing

Brannon King

May 30, 2023 20:14

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SCIP has SCIProwGetBasisStatus and SCIPcolGetBasisStatus methods. What is Gurobi's equivalent to these methods? This question relates to my larger goal of computing the corner rays at an optimal LP point.

Related to

• Simplex

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  David Torres Sanchez

  • Gurobi Staff

  June 01, 2023 11:12

  Hi Brannon,

  Each variable has a VBasis attribute with values:

  0 (basic), -1 (non-basic at lower bound), -2 (non-basic at upper bound), and -3 (super-basic).

  Each linear constraint has CBasis attribute with values:

  0 (basic) or -1 (non-basic)

  Cheers, 
  David

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  Brannon King

  June 19, 2023 19:50

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  Each row has an associated slack variable. Does the slack variable use the same upper/lower status information? How would I determine this VBasis information for a slack variable, since CBasis doesn't specify upper/lower?

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