I want to convert this formula into code

ユーザーの入力を待っています。

석찬 이

2024年02月14日 08:20

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help me plz..

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:30

  This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
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  Ronald van der Velden

  • Gurobi Staff

  2024年02月14日 08:37

  Have you tried it step-by-step and where did you get stuck exactly? I would start creating a variable containing the value of the inner sum. Then try to create the max and finally the outer sum.

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  석찬 이

  2024年02月14日 10:51

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  T = ['t1','t2','t3','t4','t5','t6','t7','t8','t9']         #index of trailer
  U = ['u1','u2','u3']                                       #index of unload dock
  B = ['b1','b2','b3']                                       #index of time bucket
  S = ['s1','s2','s3']                                       #index of output_station
  
  num_trailer = len(T)
  num_unload_docks = len(U)
  num_time_bucket = (len(T) // len(U))
  num_output_station = len(S)
  
  

  Lmax = quicksum(max(quicksum(t[d, s] * x[t, b] for t in range(num_trailer) for b in range(num_time_bucket)))for s in range(num_output_station)for b in range(num_time_bucket))

  Tried to convert sigma into code. Is this the right code?

  
  
  

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  Ronald van der Velden

  • Gurobi Staff

  2024年02月15日 07:02

  • The inner quicksum seems incorrect - you reference d which is not defined anywhere.
  • Then you take the max over just a single quicksum. You need multiple things to take the maximum; I guess you will need to move one of the two iterator variables/loops outside the quicksum.
  • For the maximum, you cannot use the built-in Python max function since it only works for scalar values, not Gurobi variables. You will want a new, auxiliary variable that will be equal to the maximum of the inner quicksums. Have a look at the max_ function for details.
  • Finally, you can sum over the auxiliary variables to get the final result.

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