Hi everyone, i'm having a problem withe my restriccions, I get this error: KeyError: ((1, 0), 1) in my first restriction

Answered

Javier Gil

November 18, 2023 16:33

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Arcos = [(i,j) for i in range(10) for j in range(10) if i!=j]

Dias = range(1,31)

 

x = model.addVars(Arcos, Dias, vtype = GRB.BINARY, name = "x") 

y = model.addVars(Nodos, Dias, vtype = GRB.BINARY, name = "y")

 

model.addConstrs(((quicksum(x[a,d] for a in [x for x in Arcos if x[1]==j])) == y[j,d] for j in Nodos for d in Dias ), name = "R1")

I cant find the problem...

Related to

• KeyError

0

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:34

  This post is more than two 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 try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Riley Clement

  • Gurobi Staff

  November 19, 2023 09:32

  Hi Javier,

  If you run the command

  print(x)

  the error will become apparent.

  - Riley

  0

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