Sajjad Hedayati
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Latest activity by Sajjad Hedayati
Sajjad Hedayati commented,
Hi, Thank you for your suggestion. Although your solution seems to work, I couldn't have applied it to my model. I wonder if there is any solution to get those extreme points in which there are som...

Sajjad Hedayati created a post,
Calling Shadow Prices Under Degeneracy
OngoingDear Gurobi community I wonder if there is any possibility that we can get degeneracy information of a degenerate optimal basic feasible solution. In fact, I need to drop those constraints that are...

Sajjad Hedayati commented,
I think that I have received the answer. Thank you, Mario!

Sajjad Hedayati created a post,
Issues with adding valid inequalities
AnsweredHi everyone I have a full integer model with both binary and positive integer variables. I would like to extract the relaxed LP solutions and apply some valid inequality. I already know that MIPNOD...

Sajjad Hedayati commented,
Thanks, Mario!

Sajjad Hedayati commented,
I think that I got my answer regarding the B&B. Thank you! What if we have a heuristic and we want to use its solution for our next optimization step by Gurobi? Like twostage programming strategie...

Sajjad Hedayati commented,
Thank you again for your explanation. Now, I wonder if you could help me with the following strategy:  Imagine we get a lower bound and an infeasible solution that is integral obtained from an ind...

Sajjad Hedayati commented,
Hi Mario, Thank you for the information. According to your answer, two questions are possible: 1 If I implement my own branchandbound algorithm via gurobipy, I will need to use the LP model and ...

Sajjad Hedayati created a post,
Applying LR to the B&B for MIPs
AnsweredHi everyone I am trying to apply Lagrangian Relaxation to BranchandBound to solve a MIP problem. How can I use LR during branching? I know that I have to use callbacks but I do not know how I can...