setObjectiveN() doesn't accept priority

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Sonia De

2024年02月13日 18:10

• 
• 

Hi,

I'm considering implementing a multi-objective model and incorporating the new feature into the objective function as the second objective, with lower priority. I'm utilizing the `setObjectiveN()` function to define the two objectives. However, it doesn't allow me to include priority as an argument, treating it as an unexpected parameter. I checked the documentation popup for the `setObjectiveN()` method and it seems it only takes two arguments.
def setObjectiveN(self,
                  expr: Any,
                  index: Any) -> None

I'm uncertain how to establish priority for the objectives. Could you provide guidance on how to define the priorities for the objectives?

関連

• Multiple Objectives

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:30

  This post is more than two 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.
• 

  Riley Clement

  • Gurobi Staff

  2024年02月14日 13:24

  Hi Sonia,

  You should be able to set the priority through the setObjectiveN method.

  If your IDE is suggesting otherwise then this may be a limitation of the IDE.

  If you're using an interactive Python session then you can use

  import gurobipy as gp
  print(gp.Model.setObjectiveN)

  to print the documentation to your screen:

  setObjectiveN(self, expr, index, priority=0, weight=1.0, abstol=1e-06, reltol=0.0, name='')
      ROUTINE:
        setObjectiveN(expr, index)
      
      PURPOSE:
        Set the model objective equal to a LinExpr or QuadExpr
      
      ARGUMENTS:
        expr:     The desired objective function.  The objective can be
                  a linear expression (LinExpr) a variable (Var) or a constant.
                  This routine will replace the 'ObjNVal' attribute on model variables
                  with the corresponding values from the supplied expression for
                  multi-objective 'index'
        index:    Identify which multi-objective to set
        priority: Set the ObjNPriority attribute for this multi-objective (default is zero)
        weight:   Set the ObjNWeight attribute for this multi-objective (default is 1.0)
        abstol:   Set the ObjNAbsTol  attribute for this multi-objective (default is 1e-6)
        reltol:   Set the ObjNRelTol  attribute for this multi-objective (default is zero)
        name:     multi-objective name (default is no name)
      
      RETURN VALUE:
        None.
      
      EXAMPLE:
        model.setObjectiveN(x + y, 1)
        model.setObjectiveN(x + y + 2*z, 2)

  - Riley

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