key Error in objective function

回答済み

Ashrafur Rahman

2021年11月07日 06:17

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I am trying to formulate an objective function but getting a key error. I have tried to unpack the tuple but it's giving me a syntax error. Could anyone help me figure this out?

The issue is with  variable u[o,d,a]. 

o and d are lists with single elements, but a is a list with tuples. I am getting the following key error: 

KeyError: (14, 4, (1, 2))

I guess I need to have (14,4,1,2) but because A is a list of tuple, I am getting the above key error. I tried to unpack the tuple using quicksum((c[a]*u[o,d,*a]), but it is showing syntax error. Any help would be really appreciated.

# Variables: 
y=mdl.addVars(D,vtype=GRB.BINARY,name="y")
x=mdl.addVars(O,D,vtype=GRB.INTEGER,name='x')
w=mdl.addVars(O,vtype=GRB.INTEGER,name="w")
z=mdl.addVars(A,vtype=GRB.BINARY, name="z") 
u=mdl.addVars(O,D,A,vtype=GRB.BINARY, name="u")
v=mdl.addVars(O,D,A,vtype=GRB.INTEGER, name="v")

#objective
obj=quicksum(f[d]*y[d] for d in D)+ quicksum( g[a]*z[a] for a in A) + quicksum((c[a]*u[o,d,a]) for a in A for o in O for d in D )+quicksum(alpha*w[o] for o in O)

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:45 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?.
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  Jaromił Najman

  • Gurobi Staff

  2021年11月08日 15:21

  Could you also post the definition of \(\texttt{O,D,}\) and \(\texttt{A}\) to make the example reproducible?

  Did you try accessing the values of \(\texttt{u}\) via

  u[o,d,a[0],a[1]]

  Best regards,
  Jaromił

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