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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2023-08-04 09:20:36 -07:00 • committed by Lev Nachmanson
parent 0c98c755ba
commit c3a373e225
2 changed files with 12 additions and 17 deletions
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11
src/math/lp/lar_solver.cpp
View file

@ -481,12 +481,9 @@ namespace lp {
bool lar_solver::remove_from_basis(unsigned j) { bool lar_solver::remove_from_basis(unsigned j) {
lp_assert(is_base(j)); lp_assert(is_base(j));
unsigned i = row_of_basic_column(j); unsigned i = row_of_basic_column(j);
for (const auto & c : A_r().m_rows[i]) { for (const auto & c : A_r().m_rows[i])
if (j != c.var() && !is_fixed(c.var())) { if (j != c.var() && !is_fixed(c.var()))
return m_mpq_lar_core_solver.m_r_solver.remove_from_basis_core(c.var(), j); return m_mpq_lar_core_solver.m_r_solver.remove_from_basis_core(c.var(), j);
}
}
return false; return false;
} }
@ -1782,9 +1779,9 @@ namespace lp {
update_column_type_and_bound_with_ub(j, kind, right_side, constr_index); update_column_type_and_bound_with_ub(j, kind, right_side, constr_index);
else else
update_column_type_and_bound_with_no_ub(j, kind, right_side, constr_index); update_column_type_and_bound_with_no_ub(j, kind, right_side, constr_index);
if (is_base(j) && column_is_fixed(j)) {
if (is_base(j) && column_is_fixed(j))
m_fixed_base_var_set.insert(j); m_fixed_base_var_set.insert(j);
}
TRACE("lar_solver_feas", tout << "j = " << j << " became " << (this->column_is_feasible(j)?"feas":"non-feas") << ", and " << (this->column_is_bounded(j)? "bounded":"non-bounded") << std::endl;); TRACE("lar_solver_feas", tout << "j = " << j << " became " << (this->column_is_feasible(j)?"feas":"non-feas") << ", and " << (this->column_is_bounded(j)? "bounded":"non-bounded") << std::endl;);
} }

6
src/math/lp/lp_core_solver_base_def.h
View file

@ -409,11 +409,9 @@ template <typename T, typename X> bool lp_core_solver_base<T, X>::pivot_column_g
lp_assert(m_basis_heading[leaving] >= 0); lp_assert(m_basis_heading[leaving] >= 0);
unsigned row_index = m_basis_heading[leaving]; unsigned row_index = m_basis_heading[leaving];
// the tableau case // the tableau case
if (pivot_column_tableau(entering, row_index)) if (!pivot_column_tableau(entering, row_index))
change_basis(entering, leaving);
else
return false; return false;
change_basis(entering, leaving);
return true; return true;
} }