LP Problem Formulation

Answered

Mohamad Abouras

• October 11, 2022 16:24

Hello,

I am using GUROBI to solve a linear programming problem.
The problem I am trying to formulate has conditions in its constraints, and I am having difficulties formulating those.
Here is a screenshot of the algorithm I am trying to implement.


I have been trying 3 days. So any help is appreciated.
Thanks in advance

1

• 

  Jonasz Staszek

  Community Moderator

  • October 11, 2022 18:24

  

  

  

  Dear Mohamad,

  I believe these resources (here and here) should be of help to you.

  Best regards
  Jonasz

  1
• 

  Mohamad Abouras

  • October 12, 2022 14:26
  • Edited

  

  

  

  Dear Jonasz,
  thank you for the resources, they helped a lot!

  Would you mind taking a look at a small code snippet just to make sure that I am going in the right direction?
  
  Structure 

  

  - Is this the correct way of defining the objective function?
  
  Some of the constraints:
  
  
  - Does the way I am formulating the constraints make sense? I am trying to make constrains redundant in case they should be ignored.

  Best regards

   

   

  0
• 

  Jonasz Staszek

  Community Moderator

  • October 13, 2022 07:25

  

  

  

  I can't see any obvious red flags from afar. In the future, we will be better able to help you if you paste your code (and format it as such) in the post, rather than pasting a screenshot.

  To assess the constraints, you can also write the model to a file using

  m.write("model.lp")

  and then study the file to check whether the constraints look they way you wish.

  Best regards
  Jonasz

  1
• 

  Mohamad Abouras

  • October 23, 2022 18:34

  

  

  

  Sorry for the late replay.

  The idea with the .lp file is really amazing, and it helped a lot.

  Thank you very much!
  
  Best Regards 
  Mohamad

  0

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