Resolving after changing objective does not use previous solution

Answered

Marco Correia

November 19, 2024 17:55

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Hi,

I have a model which I solve to optimality. After, I change the objective, and call "optimize()" again. Gurobi says the previously found solution did not produce an incumbent. I cannot see why, since I did not add any constraint. I do have some lazy constraints, but they are deterministic, so I would still be confused if that makes a difference. Thanks!

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  Marika Karbstein

  • Gurobi Staff

  November 20, 2024 09:05

  Can you share the Gurobi log file of the whole run?
  Are you only changing the Obj attribute of some variables? Or do you use some other calls?

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  Marco Correia

  November 20, 2024 12:30

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  Hi Marika,

  Looking at the log myself made me realize that one of the lazy constraints was not so deterministic after all :) 

  All good with gurobi, thanks!

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