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kernel

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-05-10 15:48:06 -07:00
parent 54648f6b50
commit 5ca3bc3212
3 changed files with 54 additions and 76 deletions
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8
src/math/simplex/sparse_matrix.h
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@ -136,6 +136,7 @@ namespace simplex {
svector<int> m_var_pos; // temporary map from variables to positions in row
unsigned_vector m_var_pos_idx; // indices in m_var_pos
stats m_stats;
scoped_numeral m_zero;
bool well_formed_row(unsigned row_id) const;
bool well_formed_column(unsigned column_id) const;
@ -144,7 +145,7 @@ namespace simplex {
public:
sparse_matrix(manager& _m): m(_m) {}
sparse_matrix(manager& _m): m(_m), m_zero(m) {}
~sparse_matrix();
void reset();
@ -216,6 +217,7 @@ namespace simplex {
unsigned column_size(var_t v) const { return m_columns[v].size(); }
unsigned num_vars() const { return m_columns.size(); }
unsigned num_rows() const { return m_rows.size(); }
class col_iterator {
friend class sparse_matrix;
@ -306,11 +308,11 @@ namespace simplex {
all_rows get_rows() { return all_rows(*this); }
numeral& get_coeff(row r, unsigned v) {
numeral const& get_coeff(row r, unsigned v) {
for (auto & [coeff, u] : get_row(r))
if (u == v)
return coeff;
throw default_exception("variable not in row");
return m_zero;
}