Objective value higher in fixed model

Answered

Max Harst

May 18, 2022 10:10

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Hello,

I modeled a maximization problem I am trying to solve as an integer program. Afterwards I'm using model.fixed() to create a fixed model of the same problem and solve it again. When analyzing the output I realized that the objective value for the fixed model is higher than for the original model. Can anyone explain to me how this is possible, because in theory the two models should yield the same result.

Thanks!

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:37

  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 try Gurobot, our chatbot interface offering instant, expert-level support.
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  Jaromił Najman

  • Gurobi Staff

  May 18, 2022 10:41

  Hi Max,

  Did you solve the model to a 0% MIPGap?

  Could you share a minimal working example (see Posting to the Community Forum)?

  Best regards, 
  Jaromił

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  Max Harst

  May 18, 2022 10:49

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  Hi Jaromil,

  thank you very much setting the MIPGap to 0% solves my problem!

  Best,

  Max

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