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fix in rounding rows

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-04-18 23:13:39 -07:00
parent 2d12874f30
commit 7f12dfbbe8
2 changed files with 23 additions and 4 deletions
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23
src/util/lp/lar_solver.cpp
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@ -397,7 +397,7 @@ void lar_solver::pop(unsigned k) {
m_settings.simplex_strategy() = m_simplex_strategy;
lp_assert(sizes_are_correct());
lp_assert((!m_settings.use_tableau()) || m_mpq_lar_core_solver.m_r_solver.reduced_costs_are_correct_tableau());
lp_assert(m_cube_rounded_rows.size() != 0 || ax_is_correct());
lp_assert(ax_is_correct());
set_status(lp_status::UNKNOWN);
}
@ -875,8 +875,8 @@ void lar_solver::update_x_and_inf_costs_for_columns_with_changed_bounds_tableau(
}
void lar_solver::fix_Ax_b_on_rounded_row(unsigned i) {
if (A_r().m_rows[i].size() <= i)
return;
if (A_r().m_rows.size() <= i)
return;
unsigned bj = m_mpq_lar_core_solver.m_r_basis[i];
auto& v = m_mpq_lar_core_solver.m_r_x[bj];
v = zero_of_type<numeric_pair<mpq>>();
@ -885,11 +885,28 @@ void lar_solver::fix_Ax_b_on_rounded_row(unsigned i) {
v -= c.coeff() * m_mpq_lar_core_solver.m_r_x[c.var()];
}
}
void lar_solver::collect_rounded_rows_to_fix() {
lp_assert(m_cube_rounded_rows.size() == 0);
for (unsigned j : m_cube_rounded_columns) {
if (j >= A_r().m_columns.size())
continue;
int j_raw = m_mpq_lar_core_solver.m_r_solver.m_basis_heading[j];
if (j_raw >= 0) {
m_cube_rounded_rows.insert(j_raw);
} else {
for (const auto & c : A_r().m_columns[j]) {
m_cube_rounded_rows.insert(c.var());
}
}
}
}
void lar_solver::fix_Ax_b_on_rounded_rows() {
collect_rounded_rows_to_fix();
for (unsigned i : m_cube_rounded_rows) {
fix_Ax_b_on_rounded_row(i);
}
m_cube_rounded_rows.clear();
m_cube_rounded_columns.clear();
lp_assert(ax_is_correct());
}

4
src/util/lp/lar_solver.h
View file

@ -88,7 +88,8 @@ class lar_solver : public column_namer {
#endif
//////////////////// fields //////////////////////////
vector<unsigned> m_cube_rounded_rows;
std::unordered_set<unsigned> m_cube_rounded_columns;
std::unordered_set<unsigned> m_cube_rounded_rows;
lp_settings m_settings;
lp_status m_status;
stacked_value<simplex_strategy_enum> m_simplex_strategy;
@ -639,5 +640,6 @@ public:
bool sum_first_coords(const lar_term& t, mpq & val) const;
void fix_Ax_b_on_rounded_rows();
void fix_Ax_b_on_rounded_row(unsigned);
void collect_rounded_rows_to_fix();
};
}