How to use the | in multilines of a matrix in LaTeX?

Question

I'm using LyX. I came across with the following Matrix:

I could use the following LaTeX for that:

\begin{bmatrix}| & |\\
\underline{x}_{1} & \underline{x}_{2}\\
| & |
\end{bmatrix}

But is it the right way? What If I want the | in multilines? Then I'll just use the | in each place. I'm sure there is a better way for that.

Do you just need to separate two columns like so? https://imgur.com/tYz9rTe — antshar, May 26 '20 at 16:57
@antshar Thanks for the reply but not. That's easy. I would like to have | on the top and bottom and x_1 in the middle. — vesii, May 26 '20 at 17:09

score 2 · Accepted Answer · answered May 26 '20 at 19:52

I think that this question is a duplicate of this: How do I typeset vertical and horizontal lines inside a matrix?

Here I put a small code where I have changed the parameters of vertical rules.

\documentclass[a4paper,12pt]{article}
\usepackage{mathtools}
\usepackage{amssymb}
\newcommand*{\vertbar}{\rule[-1.5ex]{1.1pt}{3ex}}
\begin{document}
\[\begin{bmatrix}\vertbar &\vertbar\\
\underline{x}_{1} & \underline{x}_{2}\\
\vertbar & \vertbar
\end{bmatrix}\]
\end{document}

How to use the | in multilines of a matrix in LaTeX?

1 Answers1