static bool same_size( const container_type &x1 , const container_type &x2 ) { return ( ( x1.size1() == x2.size1() ) && ( x1.size2() == x2.size2() ) ); }
static void resize( const container_type &x , container_type &dxdt ) { dxdt.resize( x.size1() , x.size2() ); }