How to get the value of a variable before the solution is generated

Wendi Feng

October 03, 2019 15:33

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Let's say I have a variable X. I'm trying to write a constraint for a math model, which contains some metrics in the constraint that requires the current value of X.

 

How should I write those kinds of constraints? 

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:22 Edited

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  Tiago Januario

  May 13, 2020 16:02 Edited

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  There are several alternatives to introduce new constraints in the model based on the X values. For instance, you can start by using a callback function, check the status of your  X variable periodically, and introduce new constraints in your MIP.

  I think you need to give more details about your model or your problem.

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