void eta_matrix<T, X>::conjugate_by_permutation(permutation_matrix<T, X> & p) {
// this = p * this * p(-1)
#ifdef LEAN_DEBUG
// auto rev = p.get_reverse();
// auto deb = ((*this) * rev);
// deb = p * deb;
#endif
m_column_index = p.get_rev(m_column_index);
for (auto & pair : m_column_vector.m_data) {
pair.first = p.get_rev(pair.first);
}
#ifdef LEAN_DEBUG
// lean_assert(deb == *this);
#endif
}
void row_eta_matrix<T, X>::conjugate_by_permutation(permutation_matrix<T, X> & p) {
// this = p * this * p(-1)
#ifdef LEAN_DEBUG
// auto rev = p.get_reverse();
// auto deb = ((*this) * rev);
// deb = p * deb;
#endif
m_row = p.apply_reverse(m_row);
// copy aside the column indices
std::vector<unsigned> columns;
for (auto & it : m_row_vector.m_data)
columns.push_back(it.first);
for (unsigned i = columns.size(); i-- > 0;)
m_row_vector.m_data[i].first = p.get_rev(columns[i]);
#ifdef LEAN_DEBUG
// lean_assert(deb == *this);
#endif
}