# Maliheh Aramon

Gurobi Staff
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## Activity overview

Latest activity by Maliheh Aramon
• Maliheh Aramon commented,

Hi Arezoo,   I noticed that when I solved an example, in the last iteration lower bound was greater than the upper bound and the tolerance was negative.  It does not happen for the different probl...

• Maliheh Aramon commented,

Hi Tomas, Yes, the model will be freed before closing the context manager. You can retrieve all the results you need for analysis/debugging inside the context manager. For example, you can save the...

• Maliheh Aramon commented,

Hi Prabhu,  When solving an LP, Gurobi terminates as soon as finding one proven optimal solution. Running the Gurobi Optimizer using different parameters such as Seed and/or Method might result in ...

• Maliheh Aramon commented,

Hi Prasanna, What I found was that there are many duplicate solutions, which does not bother me because I can simply delete the duplicates later, The solutions added to the pool should be distinc...

• Maliheh Aramon commented,

Hi Aiswariya,  Adding a 1D array of 7M matrix variables to an empty Gurobi model object using the method Model.addMVar() took around 1.8MB of memory on my laptop. Therefore, I doubt the issue is re...

• Maliheh Aramon commented,

Hi Tanmoy,  Do you mean your model formulation is parametrized based on a given $$p$$ value? Gurobi Callbacks provide some flexibility such that you can add new lazy constraints to the model by the...

• Maliheh Aramon commented,

Hi Shri, Assuming the primal constraint is linear, you can first access the specific constraint given its name by the method Model.getConstrByName() and then retrieve its dual using the attribute P...

• Maliheh Aramon commented,

Hi Ralph,  I think you mean you used NoRelHeurTime=7000. It apparently did not help at all and could not find an incumbent better than the one found by a heuristic immediately after presolve. You m...

• Maliheh Aramon commented,

Hi Arezoo,  Then I get different objective values in the second run. Am I wrong to assume that I should get similar optimal values by fixing only Xs? No, starting from any initial solution either...

• Maliheh Aramon commented,

Hi Prasanna,  Let's say X1 = 0.999 and X2 = 0 is a solution, then Gurobi gives out another solution with X1 = 1.0003 and X2 = -0.0001 which is basically the same as before. So, how would I avoid t...