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* avoid creating rows with  all but one fixed columns

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* pb

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* once in a while flip bounds of boxed variables during move_nbasic_to_bounds

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* flip rarely

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* flip rarely

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* flip rarely

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* return an empty model when lar_solver is not ready

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* randomly change bounded base var on demand only

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>

* randomly change bounded base var on demand only

Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-09-25 17:47:29 -07:00 • committed by GitHub
parent e775964cfd
commit 25724401cf
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10 changed files with 72 additions and 70 deletions
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src/math/lp/int_cube.cpp
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@ -43,7 +43,7 @@ namespace lp {
if (st != lp_status::FEASIBLE && st != lp_status::OPTIMAL) {
TRACE("cube", tout << "cannot find a feasible solution";);
lra.pop();
lra.move_non_basic_columns_to_bounds();
lra.move_non_basic_columns_to_bounds(false);
// it can happen that we found an integer solution here
return !lra.r_basis_has_inf_int()? lia_move::sat: lia_move::undef;
}