TypeError: 'gurobipy.LinExpr' object is not iterable

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Geoffrey James Kameni Tchokode

2022年03月17日 18:10

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Hi,

I'm trying to code the order batching model  but i get this error. 

Can someone tell me, what is wrong?

Thks

 

 

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:41

  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03月17日 19:14

  You are using two quicksums in line 3. This line should either read

  2*quicksum(quicksum(uvar[jbatch,kaisle] for jbatch in Batch) for kaisle in G)

  or

  2*quicksum(uvar[jbatch,kaisle] for jbatch in Batch for kaisle in G)

  Best regards, 
  Jaromił

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  Geoffrey James Kameni Tchokode

  2022年03月18日 08:46

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  thks!!!

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