'gurobipy.QuadExpr' object is not iterable

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Felicity Sung

2022年10月19日 08:19 編集済み

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I have trouble for fixing this problem! Plz help for figuring out what the problem is!!! Tks!!!!!

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  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:26

  This post is more than three 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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  Jaromił Najman

  • Gurobi Staff

  2022年10月20日 08:36

  There are a few issues here.

  quicksum(T[j])

  tries to access the one element \(\texttt{T[j]}\) but \(\texttt{j}\) is not defined.

  In

  for j in job + PM*YPM[j] for j in job

  the index variable \(\texttt{j}\) is defined twice. This may lead to any kind of errors. Moreover, it is not visible from the screenshot you posted whether \(\texttt{job + PM*YPM[j]}\) even works.

  You could try

  quicksum(T[j] for j in job)

  If this does not work, please provide a minimal reproducible example (not just a screenshot).

  Best regards, 
  Jaromił

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