How to create input variable to my Vehicle platooning problem?

Answered

John Raphy Karippery

January 11, 2021 20:24

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Hello, 
I'm new to Gurobi and not a really good programmer. I need to model a Multi-objective vehicle platooning problem. I created a mathematical model. I need to verify my model with Gurobi.
After reading the documentation I am so confused .

How to create Sets of variables in Gurobi using multidict ?

I do something like that. 

location,cost = gp.multidict({("A","B"): 12,("C","A"): 10,("A","D"): 12,("D","B"): 15,("F","B"): 20, ("C","D"): 17,("F","C"): 19,
("C","E"): 15, ("F","E"): 11})
 

How can I add time to each location? for example from A to B it take 5 min 20 second?
  

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:02 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?.
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  Jaromił Najman

  • Gurobi Staff

  January 14, 2021 12:13 Edited

  Hi John,

  You can add a time by extending the multidict as

  location,cost,time = gp.multidict({
  ("A","B"): [12, 320],
  ("C","A"): [10, 600],
  ("A","D"): [12, 120],
  ("D","B"): [15, 450],
  ("F","B"): [20, 1200],
  ("C","D"): [17, 720],
  ("F","C"): [19, 240],
  ("C","E"): [15, 300],
  ("F","E"): [11, 360]})

  The keys of the multidict will be stored in location, the first entries of the lists will be stored in cost, and the second entries of the lists will be stored in time. Please, have a look at the documentation of multidict for more details and the examples diet.py and netflow.py for applications.

  Best regards,
  Jaromił

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