Jørgen Skålnes
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Latest activity by Jørgen Skålnes-
Jørgen Skålnes commented,
Hi Jaromił, I see my description could have been better. To clarify: When your lazy constraints make the initial integer variables infeasible, then it makes sense that Gurobi does not accept your...
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Jørgen Skålnes commented,
Hi,Thank you Jaromił! I did not think to run this from the commandline interface, but when I do I get the same results as you do. This helped me to focus on the right place. The problem seems to ar...
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Jørgen Skålnes commented,
Hi Jaromił,Thank you for the quick reply. Please note that by fixing the integer and binary variable to some value, Gurobi has a completely different problem at hand since the presolving reductio...
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Jørgen Skålnes commented,
Hi, I am experiencing a similar problem. I am trying to give the MIP solver an initial incumbent solution using the Start attribute for every binary and integer variable of the model. However, I ge...
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Jørgen Skålnes created a post,
Is the root node included in the nodeCount attribute?
AnsweredHello,From the documentation of nodeCount it says: "Number of branch-and-cut nodes explored in the most recent optimization." Moreover, under MIP Logging it says that nodeCount is zero whenever the...
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Jørgen Skålnes commented,
Thank you for the reply. I do encounter integer solutions on the way, but after some more debugging I find that the cut loop is aborted after adding a lazy constraint in MIPNODE. What I referred to...
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Jørgen Skålnes created a post,
Controlling cut generation in the root node setting the CutPasses parameter
AnsweredHi,I'm developing a Branch-and-cut algorithm, where I add user specific cuts and lazy constraints through a callback. I have encountered the problem that the cut generation in the root node seems t...