如何输入代码来获取 beamer 中的增强矩阵

Question

我想获取beamer中的两个增广矩阵，代码该怎么写？

Answer 1

一种方法是使用nicematrix。

\documentclass{article}
\usepackage{nicematrix}
\usepackage{tikz}
\begin{document}
\[\begin{pNiceArray}[xdots/shorten=1.5ex]{CCCCCCC} 
1 & \Cdots & c_{1r} & c_{1,r+1} &\Cdots & c_{1n} & d_1\\ 
\Vdots &  & \Vdots & \Vdots &  & \Vdots  & \Vdots \\ 
0 & \Cdots & 1 & c_{r,r+1} &\Cdots & c_{rn} & d_r\\ 
0 & \Cdots & 1 & 0 &\Cdots & 0 & \textcolor{red}{d_{r+1}}\\ 
0 & \Cdots & 1 & 0 &\Cdots & 0 & 0\\ 
\Vdots &  & \Vdots & \Vdots &  & \Vdots  & \Vdots \\ 
0 & \Cdots & 0 & 0 &\Cdots & 0 & 0 
\CodeAfter
\begin{tikzpicture}
\draw[dashed] (col-7|-row-1) --  (col-7|-row-8);
\end{tikzpicture}
\end{pNiceArray}\]
\end{document}

这当然也适用于beamer文档。

\documentclass{beamer}
\usepackage{nicematrix}
\usepackage{tikz}
\begin{document}
\begin{frame}[t]
\frametitle{An augmented matrix}

\[\begin{pNiceArray}[xdots/shorten=1.5ex]{CCCCCCC} 
1 & \Cdots & c_{1r} & c_{1,r+1} &\Cdots & c_{1n} & d_1\\ 
\Vdots &  & \Vdots & \Vdots &  & \Vdots  & \Vdots \\ 
0 & \Cdots & 1 & c_{r,r+1} &\Cdots & c_{rn} & d_r\\ 
0 & \Cdots & 1 & 0 &\Cdots & 0 & \textcolor{red}{d_{r+1}}\\ 
0 & \Cdots & 1 & 0 &\Cdots & 0 & 0\\ 
\Vdots &  & \Vdots & \Vdots &  & \Vdots  & \Vdots \\ 
0 & \Cdots & 0 & 0 &\Cdots & 0 & 0
\CodeAfter
\begin{tikzpicture}
\draw[dashed] (col-7|-row-1) --  (col-7|-row-8);
\end{tikzpicture}
\end{pNiceArray}\]
\end{frame}

\end{document}

您也可以使用arydshln。

\documentclass{beamer}
\usepackage{arydshln}
\begin{document}
\begin{frame}[t]
\frametitle{An augmented matrix}

\[\left(\begin{array}{cccccc:c} 
1 & \cdots & c_{1r} & c_{1,r+1} &\cdots & c_{1n} & d_1\\ 
\vdots &  & \vdots & \vdots &  & \vdots  & \vdots \\ 
0 & \cdots & 1 & c_{r,r+1} &\cdots & c_{rn} & d_r\\ 
0 & \cdots & 1 & 0 &\cdots & 0 & \textcolor{red}{d_{r+1}}\\ 
0 & \cdots & 1 & 0 &\cdots & 0 & 0\\ 
\vdots &  & \vdots & \vdots &  & \vdots  & \vdots \\ 
0 & \cdots & 0 & 0 &\cdots & 0 & 0
\end{array}\right)\]
\end{frame}

\end{document}