for loop for optimisation model

回答済み

Zahra Namazian

2022年02月26日 07:18

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Hi,

I have an optimization model in a "for loop"using Python/Jupyter Notebook and Gurobi. For each iteration, I need to record the decision variables and use them as an input of the next "for loop" to optimise the model for new ranges. I was wondering if you would advise me how I can record the decision variables in each loop. 

Thanks,

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  Simon Bowly

  • Gurobi Staff

  2022年02月28日 02:31

  Hi Zahra,

  Could you elaborate on what you are trying to achieve here? Are you trying to solve separate models in each iteration of the loop and extract the solution values to use in a separate model, or do you need the variables themselves in order to build constraints in another iteration?

  Best regards,
  Simon

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  Zahra Namazian

  2022年02月28日 02:46

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  Hi Simon,

  Thank you so much for your reply.

  I deal with both condition you explained. I wondered if you could please explain how I can solve the above mentioned problems.

  Thanks and regards,

  Zahra

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  Simon Bowly

  • Gurobi Staff

  2022年03月01日 04:20

  Hi Zahra,

  You can store solution values and/or variables in a Python dictionary in order to access them in later iterations. It may help to familiarise yourself with the following article covering the basics of python dictionaries: https://www.pythontutorial.net/python-basics/python-dictionary/

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  Zahra Namazian

  2022年03月01日 10:38

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  Hi Simon,

  Thank you so much for your reply.

  It works for my problem. 

  Kind regards,

  Zahra

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