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fix restore_x by recalulating new column values

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2026-03-14 14:50:22 -10:00
parent a66448f1c5
commit a930a8d5d4
1 changed files with 6 additions and 2 deletions
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8
src/math/lp/lar_solver.h
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@ -446,8 +446,12 @@ public:
cs.restore_x();
if (backup_sz < current_sz) {
// New columns were added after backup.
// move_non_basic_columns_to_bounds snaps non-basic
// columns to their bounds and finds a feasible solution.
// Recalculate basic variable values from non-basic ones
// to restore the Ax=0 tableau invariant, then snap
// non-basic columns to their bounds and find a feasible solution.
for (unsigned i = 0; i < A_r().row_count(); i++)
if (r_basis()[i] >= backup_sz)
set_column_value(r_basis()[i], get_basic_var_value_from_row(i));
move_non_basic_columns_to_bounds();
}
else {