Variable constraint

Answered

Rayan SAAD

June 02, 2023 13:47

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Helloo,

i add a constarint on my variable X[i,j,t] like  X[i,j,t] <= 13

But after resolving the model i found that X[0,2,1]=16

I dont where is the mistake;

Thank youu 

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:42

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  Marika Karbstein

  • Gurobi Staff

  June 02, 2023 14:00

  Your third for-loop looks not correct: 

  for j in range(j)

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  Rayan SAAD

  June 02, 2023 14:21

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  thanks a lot !

  But now i want to add conditions like this 

  

  But i dont know how to write in python

  thank you !

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  Marika Karbstein

  • Gurobi Staff

  June 02, 2023 14:42

  It is not easy to understand what you really want to do with these code snippets and what is not working. But the following is possible:

  I=range(3)
  T=range(5)
  J=range(4)
  x = model.addVars(I, J, T, name='u')
  
  for i in I:
      for t in T:
          for j in J:
              if j==1:
                  model.addConstr(x[i, j, t] <= 4)
              elif j==2:
                  model.addConstr(x[i, j, t] <= 3)
              else:
                  model.addConstr(x[i, j, t] <= 1)  

  What kind of problem do you have?

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  Rayan SAAD

  June 02, 2023 14:45

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  Perfect, i just forgot the loop for j

  thank youu !!

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