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    "# How to construct matrix\n",
    "|  |know shape at compile time  | NOT know |\n",
    "|--|--|--|\n",
    "| small size (around 4x4) | Matrix<T, rows, cols> m | Matrix<T, -1, -1> m|\n",
    "| large size | Matrix<T, -1, -1> m(rows, cols) | Matrix<T, -1, -1> m |\n",
    "\n",
    "# Difference of block operator\n",
    "\n",
    "m.block<p, q>(i, j)\n",
    "\n",
    "m.block<i, j, p, q> "
   ]
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