Jan Krause
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Activity overview
Latest activity by Jan Krause-
Jan Krause commented,
Hello Jaromił Najman, okay, thanks for that explanation. :) Best, Jan
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Jan Krause commented,
Hi Jaromił Najman, yes, this helps. Thank you very much! Is there a special reason, why these bound propagations are not considered as Presolve? In my opinion, it is unnecessarily confusing to the...
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Jan Krause commented,
Thanks
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Jan Krause commented,
It seems that - the presolved model (having Presolve=0) has R0+all Mccormick envelopes (explicitly) + all product variable equations + trivial bounds 0 and 1 - my manual McCormick relaxation has R0...
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Jan Krause commented,
Yes, that is correct. Thanks for your help!
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Jan Krause commented,
Here is the .lp file \ LP format - for model browsing. Use MPS format to capture full model detail.Maximize 1.29 x[1] + 3.91 x[2] - 1.24 x[3] - 0.68 x[4] - 2.74 x[5] - 2.09 x[6] + 4.72 x[7] - 1....
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Jan Krause commented,
It turned out, that even only R0: x[1] + x[2] + x[3] <= 0.48 yields a difference in the values.
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Jan Krause commented,
In this case the values are the same.Jaromił Najman I have tested the same problem (with all constraints) in SCIP. There I explicitly disabled propagation and then the values are the same. It woul...
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Jan Krause commented,
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Jan Krause commented,
Yes. When I solve with Presolve=0 and NodeLimit=0, such that the optimization terminates with the root relaxation without cuts (is that right?), then I get an objective value 4.381421504525e+01, th...