What does the index property in setObjectiveN do when it is set to 0?Answered
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?
You can add an objective via the
setObjectivemethod. This is then the primary objective. You can add multiple objectives using the
setObjectiveNmethod. If an objective was already set with the
setObjectiveNwith 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.
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