I cant see variable notations in printint results

回答済み

Mustafa Ustuncelik

2021年12月08日 16:06

• 
• 

Hello,

When I write to see variable values i cant see the variable notations in the results.

My variable definition:

x = {}
for j in range (1,3):
for o in range (1,3):
for m in range(1,3):
x[j,o,m] = model.addVar(vtype=GRB.BINARY,name='x')

#Printing Results
for v in model.getVars():
print('%s %g' % (v.varName, v.x))

#My results:

x 1
x 0
x 0
x 1
x 1
x 0
x 0
x 1

why cant I see the results like:

x[1,1,1] 1

x[1,1,2] 0

..

 

thanks in advance

 

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:43 編集済み

  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?.
• 

  Jaromił Najman

  • Gurobi Staff

  2021年12月09日 09:24

  Hi Mustafa,

  This is because you name all of your variables "x". The addVar uses the provided name since it creates exactly 1 optimization variable. There are multiple ways of how to get the variable names you want. You can either set them manually via

  for j in range (1,3):
    for o in range (1,3):
      for m in range(1,3):
        x[j,o,m] = model.addVar(vtype=GRB.BINARY,name="x[%d,%d,%d]"%(j,o,m))

  or use the addVars method, which will generate these names automatically

  J = [1,2]
  O = [1,2]
  M = [1,2]
  x = model.addVars(J, O, M, vtype=GRB.BINARY, name="x")
  # access variables via x[j,o,m]

  Best regards,
  Jaromił

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