Solution violates box constraints

Awaiting user input

Renata Pedrini

February 10, 2022 18:54

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I have been using Gurobi for a long time to solve optimization problems, however, recently the solver is giving me a solution that violates the box constraints of the optimization model. There is a variable that must be greater than zero, but the solution gives me a negative value. The negativity is not small, it can be more than -1000.
I already tried to run the problem with .mps and the negativity doesn't happen. An important piece of information is that I solve several problems iteratively and, in the middle of my algorithm, one of the problems that I am solving returns the negative solution. It's not always the same problem, it's not always the same variable that is negative. Honestly, I've tried everything and I don't know how to solve this. It is a linear model.

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  Jonasz Staszek

  • Community Moderator

  February 12, 2022 08:53

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  Hi Renata,

  based on your inputs it is difficult to tell what could be going wrong.

  Could you show us at least a minimum working example of your code?

  Best regards
  Jonasz

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