How to print objective values, runtime of each iteration?

Answered

Tanmoy Das

February 28, 2023 17:08

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Hello, I need to print values of objective for each iteration (not just two iterations as shown below). I think callback function could be useful. But, cant find the correct syntax.

Note: it's a MIP (multiobjective optimization)

 

Related to

• Multiple Objectives
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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:48

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  Riley Clement

  • Gurobi Staff

  March 02, 2023 04:19

  Hi Tanmoy,

  This isn't possible unfortunately.  You can get information related to the simplex method via callback, but not at every iteration.  Can I ask what interests you in having this information?

  - Riley

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  Tanmoy Das

  March 02, 2023 04:25

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  I want to draw the linechart of iteration vs runtime & iteration vs % gap kinda similar to the below figure
  
  

  

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  Riley Clement

  • Gurobi Staff

  March 02, 2023 05:05

  Hi Tanmoy,

  I'm not aware of any solver that will give you the data that you're wanting unfortunately, but perhaps the most likely candidate is SoPlex.  I don't think this would be easy task though.

  - Riley

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  Riley Clement

  • Gurobi Staff

  March 02, 2023 12:41

  Hi Tanmoy,

  Just to follow up, it has been suggested by a colleague that you may be confusing simplex iteration with node processing.  Can you explain in detail what you are referring to?

  - Riley

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