Retrieve extreme ray for unbounded problems in MATLAB

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Hao Hu

May 12, 2023 22:49 Edited

I have an unbounded problem, and I need to extract the extreme ray after solving it.

Based on the documentation, I should set parameter in the following way. But it seems that the solver just ignores it.

https://www.gurobi.com/documentation/9.5/refman/infunbdinfo.html#parameter:InfUnbdInfo

Here is my setting,

params_gurobi = [];

params_gurobi.InfUnbdInfo = 1;

 

result = gurobi(problem, params_gurobi);

 

This is the output

result = 

  struct with fields:

          status: 'UNBOUNDED'
     versioninfo: [1×1 struct]
         runtime: 0.001487016677856
            work: 0.001996039242957
        objbound: Inf
       objboundc: Inf
       itercount: 0
    baritercount: 0
       nodecount: 0
          maxvio: 8.881784197001252e-16

This is no extreme ray information.

Related to

• MATLAB
• Unbounded

0

• 

  Jaromił Najman

  • Gurobi Staff

  May 15, 2023 08:30

  Could you please share the log/console output of your call?

  0

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