Anne Li van der veen
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Activity overview
Latest activity by Anne Li van der veen-
Anne Li van der veen commented,
hi, im not able to set the DualReductions parameter to 0 for some reason. Im using the pyomo packages and gurobi as a sovler. #Solversolver = po.SolverFactory('gurobi')result = solver.solve(model,...
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Anne Li van der veen commented,
Hi Marika, thanks for your reply. i tried the Model.computeIIS() already, but unfortunately i do not get it working in my code. for the lp.py example, i am unable to load the packages required. is...
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Anne Li van der veen created a post,
How to check which constraints make model infeasible?
AnsweredHi all, When i try to solve my optimization model i receive the following output, how can i check which constraint makes the model infeasible/how can i fix this best? furthermore, i get an error w...
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Anne Li van der veen created a post,
Modelling Multi period flows
Awaiting user inputHi all, im trying to model the following network where the arcs represent a specific flow of goods that is send through the network. there are some fixed arcs included in the network (e.g., the fl...
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Anne Li van der veen commented,
Hi Jonasz, thanks a lot . i implemented it like this and it seems to work. unfortunately i ran into the next problem while trying to define the objective function. i used the code described above a...
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Anne Li van der veen commented,
Hi Jonas, Thanks for your reply. I'm trying to model an optimzation of the optimal pallet mix for a company, in order to find the trade-off between costs and sustainability. Find below some of the ...
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Anne Li van der veen created a post,
Include time periods into arcs
Ongoinghi all, im trying to model the following network into python, as input for my mathematical model. however, i do not know how to include the different time periods to the possible connections betwe...
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Anne Li van der veen created a post,
Key error objective function
Awaiting user inputhi all, im trying to code my objective function but keep getting a key error ( KeyError: (1, 3, 'RC', 'CPM') ), dont know how to resolve it. any help would be appreciated #Import packagesimport py...