TypeError: 'gurobipy.LinExpr' object is not iterable

Answered

Çağlar Aydın

• October 29, 2022 12:30

mdl.addConstrs(((x[0,2]+x[0,3]) <= (max(x[0,2]+x[0,3]))), name='22')

 

Why is the error occuring?

1

• 

  Jaromił Najman

  Gurobi Staff

  • November 02, 2022 09:34

  I am not sure what you are trying to model with your constraint. Currently, your constraint reads

  \[\begin{align*}
  x_{0,2} + x_{0,3} \leq \max(x_{0,2} + x_{0,3})
  \end{align*}\]

  which is redundant. If you are trying to implement

  \[\begin{align*}
  x_{0,2} + x_{0,3} \leq \max(x_{0,2},x_{0,3}, \dots)
  \end{align*}\]

  then you have to us the addGenConstrMax method.

  Note that this method only accepts single variables. It does not accept linear or quadratic expressions. Thus, if you want to take the \(\max\) of a more complex term, you have to introduce auxiliary variables and equality constraints.

  Best regards, 
  Jaromił

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