model write contains duplicate constraints and variables

Answered

Iason Liagkas

• May 05, 2024 09:32

Hello guys, I have a model and when I do model.write() the created file contains the binary variables plenty of times and a constraint 2 times. I do not create the variables or the constraint 2 times. Is this a typical behavior or is something going wrong? 

Kind regards
Iason

Related to

• Model Files

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• 

  Simranjit Kaur

  Gurobi Staff

  • May 06, 2024 00:22

  Hi Iason,

  Please check if the variables or constraints that appear duplicated have the same name in your code. In Gurobi, if different variables or constraints are given the same name, they may appear as duplicates in the output file generated by model.write(), despite being distinct objects. Always assign unique names to each variable and constraint to prevent this issue.

  Best regards,
  Simran

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  Iason Liagkas

  • May 06, 2024 00:39

  

  

  

  Thanks Kaur. This was the case as I was using the code:

  for i in ["I","E"]:
    for r,s in drs.keys():
      MPmodel.addGenConstrPWL(Rirs[i,r,s], lRirs[i,r,s], horizPoints, verticalPoints, "log_approximation")

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  Simranjit Kaur

  Gurobi Staff

  • May 06, 2024 00:42

  Great to know this is resolved!

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