Retrieve an existing solution of decision variables and and assing it to another one

Answered

Abde

• September 07, 2023 16:05

I am working on an optimization problem with lagrange algorithm, I have two problems in the algorithm, so I would like to fix the solution obtained from the first problem let's say S1[s,t] to the second decision variable to make it fixed / as a parameter, I am using Gurobi python in this problem, I have tried  S1[s,t].x to retrieve and assign the current solutions to the second decision variable S2[s,t], but it looks not working. Thank you in advance.

Best Regards,

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• Python

1

• 

  Maliheh Aramon

  Gurobi Staff

  • September 07, 2023 21:52

  Hi Abde, 

  To fix the variable \(\texttt{S2[s,t]}\) to the value of the variable \(\texttt{S1[s,t]}\) already optimized, you can use one of the approaches below:

  • Via setting the lower and upper bounds 

  S2[s,t].LB = S1[s,t].X
  S2[s,t].UB = S1[s,t].X

  • Via adding an additional constraint 

  model.addConstr(S2[s,t] == S1[s,t].X)

  
  Best regards,

  Maliheh

  1
• 

  Abde

  • September 08, 2023 06:32
  • Edited

  

  

  

  Dear Ms. Maliheh,

  Thank you so much for your kind reply, I really appreciate your help.

  Best Regards,

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