unsupported operand type(s) for +: 'Constr' and 'Var'

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Ege ö

2024年06月02日 19:46

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Hi,

I have an error for this code, can you please tell me what part should I need to rewrite?

Both equation sides should occur for each month, I simply expected to obtain 2 variable summation to be tr variable, however it gives an error.

T= m4.addConstrs( tr[month]  == gp.quicksum( Ci[month] + Cr[month]) for month in months)

TypeError: unsupported operand type(s) for +: 'Constr' and 'Var'

 

Thank you,

Best regards

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:24

  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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  Simranjit Kaur

  • Gurobi Staff

  2024年06月02日 22:18

  The quicksum() function takes a list of terms as arguments. The correct usage in your case would be

  T = m4.addConstrs( tr[month]  == gp.quicksum( [Ci[month], Cr[month]]) for month in months)

  Alternatively, you can use

  T = m4.addConstrs( tr[month]  == Ci[month] + Cr[month] for month in months)

  This will create a constraint for each month, ensuring that tr[month] equals the sum of Ci[month] and Cr[month].

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