Tupledict with lists for values

Answered

Pavithra Sreekumar

October 05, 2021 15:26

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Hello! 

I am trying to create a tupledict() where : 

("Type A" , "Time period 1") , ("Type B" , "Time period 1") etc  are the keys and the corresponding values are in the form of  lists. Let us consider an example of 5 elements with values (5,10,15,20,21) and (3,6,9,12,15) respectively.

When I am referring to this tupledict in a constraint, how do I access each of the values in the list/ refer to them separately as an index? For example, I want to refer to the following:

("Type A", "Time period 1", "Element 1") : 5

("Type A", "Time period 1", "Element 2") : 10

("Type A", "Time period 1", "Element 3") : 5

etc.

Normally, I would type this out but I am dealing with a list which is significantly larger than 5 elements. How can I proceed with this?

 

Thank you in advance!

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 02:46 Edited

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• 

  Maliheh Aramon

  • Gurobi Staff

  October 05, 2021 21:22

  Hi Pavithra,

  Let values be the list of the elements, (5, 10, 15, 20, 21) in your example. You can just write:

  d = tupledict([(("Type A", "Time period 1", index), value) for 
                                       index, value in enumerate(values)])

  Then \(\texttt{d}\) will be:

  {
   ('Type A', 'Time period 1', 0): 5, ('Type A', 'Time period 1', 1): 10, 
   ('Type A', 'Time period 1', 2): 15, ('Type A', 'Time period 1', 3): 20, 
   ('Type A', 'Time period 1', 4): 21
  }

  
  Best regards,

  Maliheh

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