gurobipy - How can I get the tupledict object using model.getVars()?

Answered

Angus Kenny

November 19, 2019 14:01

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I have established all of my model variables using the x = model.addVars(list1,list2) command which gives a tupledict with len(list1)*len(list2) variables, accessed by x["key1","key2"],  but when I use x = model.getVars() in a callback, it gives me a list of variables instead of the original tupledict that I have used to establish them all.

How can I access the tupledict data structure from within my callback function? failing that, is there any easy mapping from tupledict key to list index that i can use? is it simply x["key1","key2"] -> x[idx(key1)*len(list2)+idx(key2)]? (here, idx("key1") is the index in list1 of string "key1")

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  December 06, 2024 00:52

  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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  Matthias Miltenberger

  • Gurobi Staff

  November 19, 2019 14:52 Edited

  Hi Angus,

  One easy trick to access your variables inside the callback is to just add them as members to the model, as it is done in the callback example that comes with Gurobi:

      model._vars = x

  Cheers,
  Matthias

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  Angus Kenny

  November 19, 2019 23:35

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  awesome, thanks a lot! that worked perfectly

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