Changing weights for a multi-objective Problem.

Answered

Mario Klostermeier

May 05, 2023 11:21

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Hello,

I am currently working on the weight sum method and would like to solve the same model with different weights. For this I would like to know how I can best change the weights of the different objectives.

Related to

• Multiple Objectives

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:44

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  Mario Klostermeier

  May 05, 2023 11:50

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  This is my solution so far. Is there a better way ?

  for w_index in range(model.NumObj):
      model.Params.ObjNumber = w_index
      model.update()
      model.ObjNWeight = weights[w_index]
      model.update()

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  Mario Ruthmair

  • Gurobi Staff

  May 10, 2023 19:49

  Hi Mario,

  You do not necessarily need the calls to update(), but apart from that this is the way to go.

  Best regards,
  Mario

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