How to get a Dual variable for a particular primal constraint

Answered

Shri Harshini Shanmugam

June 27, 2022 07:10

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How to get the dual variable for a particular primal constraint using Pi in gurobi

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:33

  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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  Maliheh Aramon

  • Gurobi Staff

  June 28, 2022 20:54

  Hi Shri,

  Assuming the primal constraint is linear, you can first access the specific constraint given its name by the method Model.getConstrByName() and then retrieve its dual using the attribute Pi. In case the constraint is quadratic, its dual can be retrieved using the attribute QCPi.

   Best regards,

  Maliheh

   

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