texdoc nicematrix
请根据上面命令呼出的文档自行补充...
\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\usepackage{nicematrix}
\begin{document}
\[
\begin{bNiceArray}{*6c*6c}[columns-width=2mm,margin]
\Block[borders={bottom,right,tikz=dashed}]{6-6}<\LARGE>{\mathbf{E}_{6m}}&&& & & &\Block[borders={bottom,right,tikz=dashed}]{2-4}<\Large>{\mathbf{O}} & & & & \Block[borders={bottom,tikz=dashed}]{2-2}<\Large>{\mathbf{E}_{2m}}& \\
& &&&& & & & & & & \\
& &&&& &\Block[borders={bottom,right,tikz=dashed}]{4-4}<\Large>{\mathbf{E}_{4m}} & & & &\Block[borders={bottom,tikz=dashed}]{4-2}<\Large>{\mathbf{O}} & \\
& &&&& & & & & & & \\
& &&&& & & & & & & \\
& &&&& & & & & & & \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
1&2 &3&4 &5&6 &7 &8 &9 &10 &11 &12 \\
\end{bNiceArray}
\]
\end{document}
问 如何用Latex 表示下图矩阵