Add Constraint for only some tuples

回答済み

Ozlem Akbudak

2021年03月20日 08:25

• 
• 
• 

Hello,

I wrote the constraint below.

I expect it to add a constraint for only (3, 1), (4, 2), (5, 2), (5, 3) these tuples.

But instead, it adds the same constraint for whole taskFS tuple list.

How can I fix this problem?

Thanks,

Ozlem

setLag = (3,4,5)

taskFS = gp.tuplelist([(2, 1),
                       (3, 1),
                       (4, 2),
                       (5, 2), (5, 3),
                       (6, 3),
                       (7, 5),
                       (8, 5), (8, 6),
                       (9, 6),
                       (10, 7), (10, 8), (10, 9),
                       (12, 10), (12, 11)])

startTimeFSLag = m.addConstrs((s[t] >= c[j] + lag[t] for t in setLag for (t, j) in taskFS), name="startTimeFSLag")

0

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 02:57 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?.
• 

  Matthias Miltenberger

  • Gurobi Staff

  2021年03月22日 16:14 編集済み

  Hi Ozlem,

  To implement this restriction, you can just put an if-condition into the list comprehension:

  only = [(3, 1), (4, 2), (5, 2), (5, 3)]
  startTimeFSLag = m.addConstrs(
      (s[t] >= c[j] + lag[t] for t in setLag for (t, j) in taskFS if (t, j) in only),
      name="startTimeFSLag",
  )

  Cheers,
  Matthias

  0

投稿コメントは受け付けていません。