gurobipy.GurobiError: Invalid argument to LinExpr multiplication

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Mohammed Osman

2022年04月17日 15:20

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Hello! I'm trying to apply a quicksum function to the following expression. But I'm receiving the following error: gurobipy.GurobiError: Invalid argument to LinExpr multiplication

sample_list: {list: 150}
sample_list = [[Wp_0, u_value_0, Qsol_0],....,[Wp_149, u_value_149, Qsol_149]]
Wp: Gurobi Binary variable
u_value: float
Qsol: {ndarray(2, 8760)} 

it works fine when I only do the following operation-->
for t in range(8760):
    x1 = ((i.Wp * i.u_value * i.Qsol[t])for i in sample_list)

But gives an error when-->
for t in range(8760):
    x1 = quicksum((i.Wp * i.u_value * i.Qsol[t])for i in sample_list)

Could you please suggest on this?

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年11月16日 23:39

  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04月19日 08:36

  Could you please provide a minimal reproducible example? An example with a sample_list of 2-3 elements and a few hard-coded u_values and Wp variables would make providing help way easier.

  From the snippet you showed, it looks like the term

  ((i.Wp * i.u_value * i.Qsol[t])for i in sample_list)

  does not generate a list as required by the quicksum function.

  0

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