Change variable type?

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Fulya Terzi

2020年06月24日 12:27

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Hi, 

I want to relax the integrality constraint on the variable. What I mean that I want to change variable type from integer to continuous type? 

How can I do this in Gurobi? 

 

Thank you in advance.

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:10 編集済み

  This post is more than three 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 why not try our AI Gurobot?.
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  Eli Towle

  • Gurobi Staff

  2020年06月24日 15:33

  Hi Fulya,

  You can modify the VType attribute of the corresponding GRBVar object. E.g., in Java:

  v.set(GRB.CharAttr.VType, GRB.CONTINUOUS)

  Thanks,

  Eli

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  Fulya Terzi

  2020年06月24日 18:40

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  Thank a lot. I got an error such as Cannot invoke set(GRB.CharAttr, char) on the array type GRBVar[].

  Since my object is GRBVar[]. How will I make for array type GRBVar?

   

  Thank you in advance

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  Fulya Terzi

  2020年06月24日 18:42

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  for (Map.Entry<String, GRBVar[]> varEntry : DecVariables.entrySet()) //IloIntVar[]
  
          varEntry.getValue(). set(GRB.CharAttr.VType, GRB.CONTINUOUS); // The error message: Cannot invoke set(GRB.CharAttr, char) on the array type GRBVar[]

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  Eli Towle

  • Gurobi Staff

  2020年06月24日 20:21

  Hi Fulya,

  You have to loop over the array and set the VType attribute for each GRBVar element individually.

  Thanks,

  Eli

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