Infeasible model in Matlab according to Gurobi

Answered

László Lindenmaier

• March 04, 2023 16:34

Hello,

I have a model of a real-time railway traffic management problem with a Matlab implementation. When I use Gurobi to solve the optimization problem, it does not provide a feasible solution. However, the built-in Matlab solver (intlinprog) can solve it. What can be the problem? 

Thank you for your answer in advance! 

Related to

• Infeasible

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  Jaromił Najman

  Gurobi Staff

  • March 07, 2023 08:55

  Hi László,

  There can be a few reason for the difference. One reason might be different tolerances used by Gurobi and the built-in Matlab solver.

  Another reason might be that the two models you solve are slightly different. You could write your model to a human-readable LP file via the gurobi_write() function. You can open the file with any standard text editor and analyze whether you model looks as it should.

  You can also let Gurobi compute an IIS, cf. How do I determine why my model is infeasible?. For this you would have to use the gurobi_iss() function and write the resullt to a file via the gurobi_write() function.

  Best regards, 
  Jaromił

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