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

Answered

Tomas Pippia

• November 01, 2022 11:08

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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  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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