How to make a deep copy of a linear expression using gurobipy

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Xinshuo Yang

2022年11月26日 18:55

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I need to make changes to my objective function, solve the model and reset the objective function to be the original one. Since my objective function is a LinExp, I was wondering how to make a deep copy of that.  

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  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:52

  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.
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  Jaromił Najman

  • Gurobi Staff

  2022年11月28日 09:34

  The best way to make a copy of your objective is to generate an additional one during construction. For example

  [...]
  origobj = gp.LinExpr([1,2,-1],[x,y,z])
  modobj  = gp.LinExpr([1,2,-1],[x,y,z])
  model.setObjective(modobj)
  # do something with current objective
  # after finishing, set the objective to origobj
  model.setObjective(origobj)

  Best regards, 
  Jaromił

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