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

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:43

  This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  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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