Constraint with for loop

回答済み

Rayan SAAD

2023年07月03日 14:33

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Hello,

I have a lillte probleme and would appreciate your help,

I created a variable X[i,j]

I want to add constraints on X dependently of i,

for example if i equal to 2,3,4 i have a constraint 

and if i equal to 1,5,6  i have an other one

Thank you for your help

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  Chung-Kyun Han

  • Gurobi Staff

  2023年07月05日 07:10

  Hi Rayan,

  Thank you for reaching us again.

  You can write concise code when you refer to our 'Python Dictionary Example' page.
  And, specifically, you can resolve your issue with 'tuplelist class'.

  The following is an arbitrary example utilizing the tuplelist class.

  import gurobipy as gp
  
  l = gp.tuplelist([(i, j) for i in range(10) for j in range(10)])
  
  m = gp.Model()
  x = m.addVars(l, name="x")
  m.update()
  
  m.addConstr(x[0, 0] <= gp.quicksum(i + j * x[i, j] for i, j in l.select([2, 3, 5], '*')))
  m.addConstr(x[1, 1] <= gp.quicksum(i + j * x[i, j] for i, j in l.select([1, 5, 6], '*')))

  Feel free to leave comments if you have any further questions.

   

  Best regards,
  Chung-Kyun Han

   

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