Grzegorz Siekaniec
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Activity overview
Latest activity by Grzegorz Siekaniec-
Grzegorz Siekaniec commented,
Hi Maliheh, thanks for prompt answer. I stumbled across this one in the context of column generation and initial solution. The example that I provided here was the smallest one where I managed to r...
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Grzegorz Siekaniec created a post,
Dual values for maximization problem with and without variable upper bound
AnsweredHello, I have a maximization model with slightly different, but equivalent, formulations:1. Variables have bounds.2. Variables do not have bounds.3. Variables bounds are expressed as constraints. B...
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Grzegorz Siekaniec commented,
Hi Jaromił, thanks for finding time to provide an answer. The reason why I want to have bidrectional dictionary is to map business domain objects with variables so it is easier to query solution an...
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Grzegorz Siekaniec created a post,
Parameter tuning - guided search
AnsweredAs far as I know, an automatic tuning tool perform its own search procedure through parameter space. It would be nice to be able to guide a search through a specific set of parameters and its value...
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Grzegorz Siekaniec created a post,
Farkas certificate
The background for my question is that I was implementing Benders decomposition and run into something strange while working on feasibility cuts. I wanted to use Farkas certificate as extreme ray o...
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Grzegorz Siekaniec commented,
Thank you for your explanation. I would like to clarify one thing - let say that I am declaring variable as integer or binary, then what you are saying is that I cannot expect that its value in sol...
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Grzegorz Siekaniec created a post,
Usage of variable as key during building of model - Python API
AnsweredI would like to use a "Var" as dictionary key while building a model. The underlying reason is that I would like to use "bidict" while building a model so I can easily reference "Var" when building...
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Grzegorz Siekaniec created a post,
How to surpress direct output to stdout if logging enabled - Python API
OngoingI would like to suppress direct logging to stdout if logging is enabled. The reason is that for an example below (modified mip.py example): import sysimport loggingimport timefrom gurobipy import *...
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Grzegorz Siekaniec created a post,
Preferred way to check if variable value is non zero
AnsweredUsing Python API, what is a preferred way to : 1. Check if variable value in a solution is non zero. 2. Get the list of non-zero variables. For '1' I checked the examples and it does not seem to be...
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Grzegorz Siekaniec commented,
It seems that PyCharm is not picking up settings from your terminal set through ".bashrc" as explained in Gurobi documentation. So although you might be able to solve it from terminal, even termina...