GurobiError: Constraint has no bool value (are you trying "lb <= expr <= ub"?)

回答済み

Mina Farajiamiri

2022年09月02日 09:27

• 
• 

Hi, I get the following error for a constraint. 

for p in P: 
    for i in I:
        for t in T:
            if qsum(SalvageValProd[p,i,t] for i in I for t in T) <= 0.05 * scaling* qsum(delta[p,i,t] for i in I for t in T) * fprod[p]:
                SVProd[p]= qsum(SalvageValProd[p,i,t] for i in I for t in T)
            else:
                SVProd[p]= 0.05 * scaling* qsum(delta[p,i,t] for i in I for t in T) * fprod[p]

I will be very grateful if someone can help me with this error!

Mina

 

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:29

  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.
• 

  Jaromił Najman

  • Gurobi Staff

  2022年09月02日 20:55 編集済み

  Hi Mina,

  It is not possible to use modelling expressions in an \(\texttt{if}\)-clause because optimization variables have no values before the model has been optimized. Thus, you have to model this conditional statement via additional variables and constraints. The Knowledge Base article How do I model conditional statements in Gurobi? should be helpful.

  Best regards, 
  Jaromił

  0
• 

  Gwyneth Butera

  • Gurobi Staff

  2022年09月02日 20:00

  For additional information, please also see the Knowledge Base article: Constraint has no bool value (are you trying "lb <= expr <= ub"?)

  0

投稿コメントは受け付けていません。