How to use computeIIS to find the constraint or the bound that is the source of the infeasibility?

Answered

Hussein Sharadga

December 28, 2022 15:55

• 
• 
• 

After I use the following command:

m.computeIIS()
m.write("m.ilp")

how to figure out which constraint was the source of the problem? Please see the lip file below: I have a big model and I even do not know where the number 0.0183 comes from

 

Thanks,

Hussein

Related to

• Python

0

• 

  Jonasz Staszek

  • Community Moderator

  December 28, 2022 16:21

  • 
  • 
  • 

  Hi Hussein,

  the bound could be due to the presolve - Gurobi might have implied it from the other constraints in your model.

  I recommend that you specify a name for each of your constraints (as described in the documentation). You will then be able to identify the constraint which causes the trouble.

  Best regards
  Jonasz

  0

Please sign in to leave a comment.