simple scheme of choosing a column for gomory cut #7039
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src/math/lp/int_solver.cpp
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| unsigned k = random() % n; | ||
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| double k_ratio = k / (double) n; | ||
| k_ratio *= k_ratio*k_ratio; // square k_ratio to make it smaller |
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this is a cube, not a square
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This reverts commit 33e783d.
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The idea is to choose columns with small non-integral part, and, of course, randomize the choice. Break the equality by comparing usage_in_terms.