Suggest users set `NonConvex = 2` for non-PSD quadratics

Answered

Oscar Dowson

• February 04, 2020 15:27
• Edited

Currently, non-convex quadratics throw "Q not PSD" if "NonConvex != 2".

Until the default value is set to 2, the error message should be modified to suggest users try setting "NonConvex=2".

For example: "Objective Q not PSD (negative diagonal entry). If you meant to solve a non-convex quadratic, set the NonConvex parameter to 2."

In the Julia interface (Gurobi.jl), we have a steady stream of users (e.g., https://github.com/JuliaOpt/Gurobi.jl/issues/285) who aren't aware that they need to set this parameter.

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• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:50

  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?.
• 

  Jaromił Najman

  Gurobi Staff

  • June 02, 2021 09:41

  This feature has been introduced with Gurobi v9.0.2.

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