Pandas_read_csv was regarded as invalid argument

回答済み

yang He

2021年08月27日 02:27

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Dear Sir/Madam,

We are trying to use Pandas and Python to read a parameter from a csv file. In the file, for example, the parameter Beta_b,k,n is ‘1’ when b=9, k=10, n=2. In the optimization model, the constraint is Beta_b,k,n≥X _b,k,n and the code in Gurobi is listed below. But an error occurs which is:

“File "src\gurobipy\model.pxi", line 3263, in gurobipy.gurobipy.Model.__addConstr.

GurobiError: Invalid argument to Model.addConstr””.

We wonder how to fix this problem. Thanks for your time.

 

Yang

 

 

 

for k in ListLiftu+ListRight:

    for n in range(1,NumCaTy):

        for b in ListDir:

cM.addConstr((dataBeta.loc[(dataBeta['b']==b)&(dataBeta['k']==k)&(dataBeta['n']==n),:].iloc[:,4].values) >= X[b,k,n],name="eq2")

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:49 編集済み

  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 why not try our AI Gurobot?.
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  Alison Cozad

  • Gurobi Staff

  2021年08月31日 14:29 編集済み

  Hi Yang,

  I recommend checking the type of

  dataBeta.loc[(dataBeta['b']==b)&(dataBeta['k']==k)&(dataBeta['n']==n),:].iloc[:,4].values

  Gurobi is expecting a scalar number here and this would return an array, as far as I can tell.  The array may only have one element but will need to be converted into a number.

  If the above does not help, could you post a minimal working example to make the issue reproducible?

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