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patch reals

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-03-29 13:25:59 -07:00
parent 3237bd9243
commit 7a950dd667
5 changed files with 107 additions and 2 deletions
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41
src/math/lp/lar_solver.cpp
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@ -2381,6 +2381,47 @@ std::pair<constraint_index, constraint_index> lar_solver::add_equality(lpvar j,
add_var_bound(term_index, lconstraint_kind::GE, mpq(0)));
}
bool lar_solver::inside_bounds(lpvar j, const impq& val) const {
if (column_has_upper_bound(j) && val > get_upper_bound(j))
return false;
if (column_has_lower_bound(j) && val < get_lower_bound(j))
return false;
return true;
}
bool lar_solver::try_to_patch(lpvar j, const mpq& val, std::function<bool (lpvar)> blocker, std::function<void (lpvar)> report_change) {
if (is_base(j)) {
bool r = remove_from_basis(j);
SASSERT(r);
(void)r;
}
impq ival(val);
if (!inside_bounds(j, ival))
return false;
impq delta = ival - get_column_value(j);
for (const auto &c : A_r().column(j)) {
unsigned row_index = c.var();
const mpq & a = c.coeff();
unsigned rj = m_mpq_lar_core_solver.m_r_basis[row_index];
impq rj_new_val = a * delta + get_column_value(rj);
if (column_is_int(rj) && ! rj_new_val.is_int())
return false;
if (!inside_bounds(rj, rj_new_val) || blocker(rj))
return false;
}
set_column_value(j, ival);
for (const auto &c : A_r().column(j)) {
unsigned row_index = c.var();
const mpq & a = c.coeff();
unsigned rj = m_mpq_lar_core_solver.m_r_basis[row_index];
set_column_value(rj,a * delta + get_column_value(rj));
report_change(rj);
}
return true;
}
} // namespace lp