What does the index property in setObjectiveN do when it is set to 0?

Answered

Tomas Pippia

November 01, 2022 11:08

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setObjectiveN has a property called "index". The documentation mentions that, for index=0, "this routine will change the primary optimization objective.". What does that mean? Which "routine" does the documentation refer to? Moreover, what does "will change the primary optimization objective" mean? Isn't the primary optimization objective determined by the "priority" property?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:26

  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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  Marika Karbstein

  • Gurobi Staff

  November 01, 2022 13:08

  Hi Tomas,

  You can add an objective via the setObjective method. This is then the primary objective. You can add multiple objectives using the setObjectiveN method. If an objective was already set with the setObjective method then setObjectiveN with index=0 will change this primary objective. See also Specifying Multiple Objectives (gurobi.com)
  Also when you change the number of multiple objectives with the parameter NumObj, the objectives are kept according to their indices. For example, if you set NumObj=1, the objective with index=0 is kept. 

  Best regards,
  Marika

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