Constraint has no Bool Value

回答済み

Rayan SAAD

2023年06月06日 12:44

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I get the following error for this constraint :

for i in range(I):
    for k in range(K):
        for t in range(T):
             model.addConstr(Tr[i,k,t]==0 or Tr[i,k,t]==9 or Tr[i,k,t]==10 or Tr[i,k,t]==11)

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  Eli Towle

  • Gurobi Staff

  2023年06月06日 20:43

  You cannot specify a group of "or" constraints like this using the Model.addConstr() method.

  Assuming \(\texttt{Tr}\) is a variable object, you can model this logic by defining the \(\texttt{Tr}\) variables as semi-continuous integer variables. Semi-continuous variables can either take a value of \( 0 \) or a value between the specified lower and upper bounds. In your case, you would add lower bounds of \( 9 \) and upper bounds of \( 11 \):

  Tr = model.addVars(I, K, T, lb=9, ub=11, vtype=GRB.SEMIINT, name="Tr")

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  Rayan SAAD

  2023年06月07日 16:00

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  it worked !!

  Tnahk you !

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