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

Answered

Ege ö

• June 02, 2024 19:46

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

-1

• 

  Simranjit Kaur

  Gurobi Staff

  • June 02, 2024 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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