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

• 

  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
• 

  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
• 

  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

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