How to add Lazy Constraints and Callbacks in MATLAB?

Answered

Ruzbeh Akbar

October 16, 2020 21:13

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How can I add Lazy Constraints and Callbacks to a Gurobi model in MATLAB? The specific problem is subtour elimination in Traveling Salesman Problem. 

 

I understand the Python example (https://gurobi.github.io/modeling-examples/traveling_salesman/tsp.html) but unsure how to implement this in MALTAB with callbacks. 

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  June 23, 2025 03:06 Edited

  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 why not try our AI Gurobot?.
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  Eli Towle

  • Gurobi Staff

  October 16, 2020 22:00

  The MATLAB API does not support callbacks. If you want to solve the TSP this way, you would have to use another API like Python, C, C++, Java, or .NET.

  In MATLAB, you can specify certain constraints to be lazy constraints by setting the Lazy constraint attribute (see here). This unfortunately won't help you solve the TSP, because these lazy constraints must be added to the model before solving.

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  Ruzbeh Akbar

  October 16, 2020 22:05

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  Thank you for the answer! 

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