Creating a matrix using brackets

Question

How to write this in latex:

The closest I've come to it, is this:

\{\begin{matrix}
    1 & 0 & 0 & 0 \\
    0 & 1 & 0 & 0 \\
    0 & 0 & 1 & 0 \\
    0 & 0 & 0 & 1
  \end{matrix}\} 

Answer 1

Use the amsmath Bmatrix

\documentclass{article}
\usepackage{amsmath}
\begin{document}
[
   \begin{Bmatrix} 
      1 & 0 & 0 & 0 \ 
      0 & 1 & 0 & 0 \ 
      0 & 0 & 1 & 0 \
      0 & 0 & 0 & 1 
   \end{Bmatrix}
]
\end{document}

Other types are:

1. \begin{matrix}...\end{matrix} without brackets
2. \begin{pmatrix}...\end{pmatrix} with parentheses brackets
3. \begin{bmatrix}...\end{bmatrix} with brackets
4. \begin{vmatrix}...\end{vmatrix} with vertical bar brackets
5. \begin{Vmatrix}...\end{Vmatrix} with double vertical bar brackets
6. \begin{Bmatrix}...\end{Bmatrix} with curly brackets as shown at top

Another workaround is to use \left...\right option.

\left\{
    \begin{matrix}
        1 & 0 & 0 & 0 \\
        0 & 1 & 0 & 0 \\
        0 & 0 & 1 & 0 \\
        0 & 0 & 0 & 1
    \end{matrix}
\right\}

This could prove helpful when typing things like open-triangle close-vertical (<a|) braces etc.