TypeError: unsupported operand type(s) for /: 'int' and 'Var'

回答済み

Hernani Delgado Chantre

2021年03月31日 16:44 編集済み

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Hi there, I am new in the Gurobi I need some direction on how to solve the following error: TypeError: unsupported operand type(s) for /: 'int' and 'Var'tinpsi_ui[u,i,k] = 1/psi_ui[u,i,k]

In the problem I am solving

psi_ui[u,i,k] = model.addVar(vtype=GRB.CONTINUOUS, name="psi_ui[%d,%d,%d]"%(u,i,k))

is a continuos decision variable,

tinpsi_ui[u,i,k] = model.addVar(vtype=GRB.CONTINUOUS, name="psi_ui[%d,%d,%d]"%(u,i,k))

is an auxiliary continuos decision variable,

x[u,v,i,k] = model.addVar(vtype=GRB.BINARY, name="x[%d,%d,%d,%d]"%(u,v,i,k))

is a binary decision variable

I have the following contraint:

 

\sum_{u\in U} \sum_{k=0}^{K} \sum_{i=1}^{C_u}

 (tau_v[v]/psi_ui[u,i])

 x_{uvik} \leq{L_v} \quad \forall{v}\in V

 

I code this contraint as follow:

for v in V:

        #constraint = LinExpr()      

        for u in U:

            for i in range(C_u[u]): 

                for k in range(1,K):

                    tinpsi_ui[u,i,k] = 1/psi_ui[u,i,k]

                    model.addConstr(inpsi_ui[u,i,k] == (psi_ui[u,i,k])**(-1)) 

                    constraint.add(tau_v[v]*x[u,v,i,k]*tinpsi_ui[u,i,k])

        model.addConstr(constraint <= L_v[v])

 

Thank you,

Hernani

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:57 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?.
• 

  Matthias Miltenberger

  • Gurobi Staff

  2021年04月01日 06:57

  Hi Hermani,

  This post should help you get started with variable divisions:
  How do I divide by a variable in Gurobi? – Gurobi Support Portal

  Cheers,
  Matthias

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