vector vertical latex code example

Example: column vector latex

\documentclass{article}
\usepackage{amsmath}
\begin{document}
  \begin{align}
    y &= \begin{bmatrix}
           x_{1} \\
           x_{2} \\
           \vdots \\
           x_{m}
         \end{bmatrix}
  \end{align}
\end{document}