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• Matrices with side curly brackets
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# Matrices with side curly brackets

If you are looking for the following behaviour
Use the following latex code

\usepackage{amsmath}

\begin{equation*}
\mathbf{X} = \begin{array}{c@{\!\!\!}l}
\left[ \begin{array}[c]{ccccc}
1 & 0 & 0 & \cdots & 0 \\
\vdots & \vdots & \vdots && \vdots \\
1 & 0 & 0 & \cdots & 0 \\
\hline
1 & 1 & 0 & \cdots & 0 \\
\vdots & \vdots & \vdots && \vdots \\
1 & 1 & 0 & \cdots & 0 \\
\hline
1 & 0 & 1 & \cdots & 0 \\
\vdots & \vdots & \vdots && \vdots \\
1 & 0 & 1 & \cdots & 0 \\
\hline
\vdots & \vdots & \vdots && \vdots \\
\hline
1 & 0 & 0 & \cdots & 1 \\
\vdots & \vdots & \vdots && \vdots \\
1 & 0 & 0 & \cdots & 1 \\
\end{array}  \right]
&
\begin{array}[c]{@{}l@{\,}l}
\left. \begin{array}{c} \vphantom{0}  \\ \vphantom{\vdots}
\\ \vphantom{0} \end{array} \right\} & \text{$n_1$ times} \\
\left. \begin{array}{c} \vphantom{0} \\ \vphantom{\vdots}
\\ \vphantom{0}  \end{array} \right\} & \text{$n_2$ times} \\
\left. \begin{array}{c} \vphantom{0}
\\ \vphantom{\vdots} \\ \vphantom{0} \end{array} \right\} & \text{$n_3$ times} \\
\vphantom{\vdots} & \\ \left. \begin{array}{c} \vphantom{0}
\\ \vphantom{\vdots} \\ \vphantom{0} \end{array} \right\} & \text{$n_l$ times}
\end{array}
\end{array}
\end{equation*}
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