adding constraint

Answered

Farzana Chowdhury

November 29, 2020 01:09 Edited

• 
• 

Hello,

I want to add the following constraint in gurobi python

I tried the following code and having a keyerror. 

for (i,j) in road_node:
      for t in range(1,n_time_horizon+1):
           m.addConstr(sum([x[v,i,u,j,u+fftt[(i,j)]] for v in vehicle_list for u in range(1,n_time_horizon+1) if u>=0 and u<=t]) - sum([x[v,j,u,i,u+fftt[(j,i)]] for v in vehicle_list for (j,i) in road_node for u in range(1,n_time_horizon+1) if u>=0 and u<=t]) <= l[(i,j)],name = "cont_4")

Could anyone please help me with this like where am i doing mistake?

 

 

 

-1

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:04 Edited

  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?.
• 

  Jaromił Najman

  • Gurobi Staff

  December 01, 2020 12:00 Edited

  Hi Farzana,

  Your code is not self-contained making it very hard to help you. In particular, could you provide the definition of \(\texttt{vehicle_list, n_time_horizon, road_node,}\) and \(\texttt{fftt}\).

  Best regards,
  Jaromił

  0
• 

  Jaromił Najman

  • Gurobi Staff

  December 03, 2020 08:24

  This post is continued in https://support.gurobi.com/hc/en-us/community/posts/360075061571

  0

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