How do I model multiple conditional statements in gurobi?

Awaiting user input

Yonghyun Choi

March 27, 2022 14:07

I want to use two if statements using binary variables, but I don't know how to use them.

Can two if statements are used in Gurobi? Examples are as follows.

A, B, C, and D are integer variables.

if (A > B) and (C>D) then,

   CASE 1

else if (A > B) and (C<D) then,

   CASE 2

else if (A < B) and (C>D) then,

   CASE 3

else 

   CASE 4

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  Jonasz Staszek

  • Community Moderator

  March 28, 2022 07:00

  • 
  • 
  • 

  Hi Yonghyun,

  this will depend on the Gurobi API you choose.

  I assume that A, B, C, D are Gurobi integer variables. Now, to retrieve their values, you must have successfully optimized first, as otherwise, the following code will throw an error.

  For Python, it could look as follows:

  # we assume that A, B, C and D are pre-defined Gurobi variablex
  if (A.X > B.X) and (C.X > D.X):
     # CASE 1
  elif (A.X > B.X) and (C.X < D.X):
     # CASE 2
  
  elif (A.X < B.X) and (C.X > D.X):
     # CASE 3
  else:
     # CASE 4

  Hope this helps. 

  Best regards,
  Jonasz

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