int determinant_sign(const bnu::permutation_matrix<std ::size_t>& pm)
{
int pm_sign=1;
std::size_t size = pm.size();
for (std::size_t i = 0; i < size; ++i)
if (i != pm(i))
pm_sign *= -1.0; // swap_rows would swap a pair of rows here, so we change sign
return pm_sign;
}
static void resize( const boost::numeric::ublas::vector< T_V , A_V > &v,
boost::numeric::ublas::permutation_matrix< T , A > &m )
{
m.resize( v.size() , v.size() );
}
static bool same_size( const boost::numeric::ublas::permutation_matrix< T , A > &m ,
const boost::numeric::ublas::vector< T_V , A_V > &v )
{
return ( m.size() == v.size() ); // && ( m.size2() == v.size() ) );
}