Generate multidict using for loop in Gurobi

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John Raphy Karippery

2021年10月10日 13:35

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I would like to generate multidict in Gurobi.

inputs:

from gurobipy import *

number_of_vehicles = 2 
vehicles_origin = [4, 6]
vehicles_destination = [3, 0]
total_time_vehicle = [35, 27]

I would like to add this input to multidict in Gurobi using for loop.

output:

truck, starting_node, destination_nodes, time = 
multidict({0:[4,3,(35)],1:[6,0,(27)]})

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  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:46 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10月11日 07:49

  The multidict function generates multiple dictionaries out of a single larger dictionary data. You can construct the dictionaries via \(\texttt{for}\)-loops

  from gurobipy import *
  
  number_of_vehicles = 2 
  vehicles_origin = [4, 6]
  vehicles_destination = [3, 0]
  total_time_vehicle = [35, 27]
  
  truck = [i for i in range(number_of_vehicles)]
  starting_node = {}
  destination_nodes = {}
  time = {}
  for i in truck:
    starting_node[i] = vehicles_origin[i]
    destination_nodes[i] = vehicles_destination[i]
    time[i] = total_time_vehicle[i]

  If you insist on using the multidict function, you can pre-construct the larger dictionary

  multi = {}
  for i in range(number_of_vehicles):
    l = [vehicles_origin[i],vehicles_destination[i],total_time_vehicle[i]]
    multi[i] = l
  
  truck, starting_node, destination_nodes, time = multidict(multi)

  Best regards,
  Jaromił

   

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