Question in gurobi

Answered

Kewei Fan

• December 28, 2023 12:16

I am a beginner, my model has this problem, I visit IIS is like this, but I do not know what this represents, can you explain to me?

Related to

• computeIIS

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• 

  Elisabeth Rodríguez Heck

  Gurobi Staff

  • December 28, 2023 12:32

  Hi Kewei,

  It looks like you are calling Model.optimize() after computing the IIS, is this correct? This results in Status code 3 (infeasible) because the IIS is by definition an infeasible set of constraints. The IIS feature is meant to be used to write the IIS into a file using 

  model.write('iismodel.ilp')

  after computing it, and then inspecting the ILP file manually to understand why your model is infeasible. 

  You may find the article How do I use 'compute IIS' to find a subset of constraints that are causing model infeasibility? helpful. 

  Best regards,

  Elisabeth

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• 

  Kewei Fan

  • December 29, 2023 05:20

  

  

  

  Thank you very much for your answer

   

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