Change variable type?

Answered

Fulya Terzi

• June 24, 2020 12:27

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.

0

• Official comment

  

  Simranjit Kaur

  Gurobi Staff

  • December 06, 2024 00:44

  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?.
• 

  Eli Towle

  Gurobi Staff

  • June 24, 2020 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

  1
• 

  Fulya Terzi

  • June 24, 2020 18:40

  

  

  

  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

  0
• 

  Fulya Terzi

  • June 24, 2020 18:42

  

  

  

  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[]

  0
• 

  Eli Towle

  Gurobi Staff

  • June 24, 2020 20:21

  Hi Fulya,

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

  Thanks,

  Eli

  1

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