Fix a variable and evaluate the Objective function value

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Azi

2020年02月24日 18:50

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Hello,

 

Is there any efficient way to fix a variable at a specific value? I want to give the solution for a variable to the model as input and see what will be the value of objective function for that specific point. The only way came to my thoughts is to add a new constraint that makes that variable equal to specific value but this increases my computational time as the number of constraints are larger now.  This is part of my model and if that helps, variable w is the order of visited nodes. I want to be able to change the order by setting the value of w at specific values. The whole model solves to optimal in 60 seconds but when I add those new constraints at the end in the following screen shot, it takes much longer to solve. Any help is much appreciated.

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:17 編集済み

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  Chags

  2020年02月26日 23:22

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  I usually make this by change the variable bounds

  try:

  w[(7,1)].ub = 2
  ​
  w[(7,1)].lb = 2

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  Azi

  2020年03月03日 20:44

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  Thank you very much. 

   

  Azadeh

   

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