block_view bA = blocked<>(A, 16, 16);
 or
 block_view bA = blocked(A);
 

  const int M = 4;
  const int N = 4;
  typedef matrix<double,
                 rectangle<>, 
                 dense<>, 
                 column_major >::type Matrix;
  Matrix A(M,N);

  for (int i = 0; i < M; ++i)
    for (int j = 0; j < N; ++j)
      A(i, j) = i * N + j;
  print_all_matrix(A);

  block_view<Matrix,2,2>::type
                     bA = blocked(A, blk<2,2>());
  print_partitioned_matrix(bA);

  block_view<Matrix>::type cA = blocked(A, 2, 2);
  print_partitioned_by_column(cA);