Jonasz Staszek
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Activity overview
Latest activity by Jonasz Staszek-
Jonasz Staszek commented,
Hi Krzysztof, I would suggest that you proceed in the way suggested by Juan. Perhaps the following code snippet will be an inspiration for you: for loc_a in locations: for loc_b in locations...
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Jonasz Staszek commented,
I would also add, to what Jaromił wrote, that your model is extremely large. I would suggest you reconsider the formulation of your model. Judging by the other questions you asked, I believe you a...
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Jonasz Staszek commented,
Hi Krzysztof, it would be much easier to help you, if you could also include a mathematical formulation of your problem. Also, two examples of input data, for which you get satisfactory and unsatis...
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Jonasz Staszek commented,
You can do that by looping over both your lists: x = gp.tupledict()for l in L: for r in R: x[l,r] = m.addVar(vtype="B", name=f"x_{l}{r}") The reasons why your code doesn't work can be fou...
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Jonasz Staszek commented,
Hi Zahra, as I wrote earlier, you cannot use Sympy objects as arguments to your objective function. Perhaps this: m.setObjective(r1 + r2, gp.GRB.MINIMIZE) is what you are looking for? Best regards...
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Jonasz Staszek commented,
Hi Zahra, first of all, I would suggest you post a minimal, reproducible example of the problem you are struggling with. Further, take a look at those two links (here and here). Perhaps they will g...
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Jonasz Staszek commented,
Hi, is there any particular reason you load Gurobi by from .gurobipy import * ? Normally one would expect to load it like this: from gurobipy import * If this doesn't help, please let us know, addi...
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Jonasz Staszek commented,
Hi Sanket, I am not sure I got your question right. Let's start from the easier part: if you want to query the value of any variable during the optimization process, you should use a callback. Coul...
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Jonasz Staszek commented,
Hi Sanket, Generally speaking, Porta and Polymake can guide you towards finding strong, potentially facet-defining inequalities for your problem. The best way you could benefit from using Porta or ...
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Jonasz Staszek commented,
Dear Sanket, you should turn to some other software package, e.g. Porta or Polymake to perform polyhedral analysis (i.e. to get a description of the convex hull you look for) As far as I know the t...