Function topRows

python/include/Eigen/src/plugins/BlockMethods.h:460–464

///
template<int N>
EIGEN_DEVICE_FUNC
inline typename NRowsBlockXpr<N>::Type topRows(Index n = N)
{
  return typename NRowsBlockXpr<N>::Type(derived(), 0, 0, n, cols());
}

/// This is the const version of topRows<int>().
template<int N>