方程太长，不适合投影仪框架，但分割环境不起作用

Question

主要代码如下：

\begin{frame}
\frametitle{Householder Transformation}

\begin{equation}
%\onslide<1->
\mathop{
    \begin{pmatrix}
        \times & \times &\times \\
        \times & \times &\times \\
        \times & \times &\times \\
        \times & \times &\times 
    \end{pmatrix}
}_{A}
%\onslide<2->
\xrightarrow{(1:4,1:3)}
\mathop{
    \begin{pmatrix}
    \mythickertimes & \mythickertimes & \mythickertimes \\
    \boldsymbol{0} & \mythickertimes & \mythickertimes \\
    \boldsymbol{0} & \mythickertimes & \mythickertimes \\
    \boldsymbol{0} & \mythickertimes & \mythickertimes 
    \end{pmatrix}
}_{Q_{1}A}
%\onslide<3->
\xrightarrow{(2:4,2:3)}
\begin{split}
\mathop{
    \begin{pmatrix}
    \times & \times & \times \\
    0 & \mythickertimes & \mythickertimes \\
    0 & \boldsymbol{0} & \mythickertimes \\
    0 & \boldsymbol{0} & \mythickertimes 
    \end{pmatrix}
}_{Q_{1}A}
%\onslide<4->
\xrightarrow{(3:4,3:3)}
\mathop{
    \begin{pmatrix}
    \times & \times & \times \\
    0 & \times & \times \\
    0 & 0 & \mythickertimes \\
    0 & 0 & \boldsymbol{0} 
    \end{pmatrix}
}_{Q_{1}A}
%\onslide<5->
\xrightarrow{(2:4,2:3)}
    R.
\end{split}
\end{equation}
\end{frame}

新的 \mythickertimes 定义如下：

\usepackage{tikz}
\usetikzlibrary{shapes.misc}
\newcommand{\mythickertimes}{ \tikz[baseline=-.55ex] \node [inner sep=0pt,cross out,draw,line width=1pt,minimum size=1ex] (a) {};}

拧紧效果如下图所示：

我怎样才能得到这样的等式：

Answer 1

使用以下提供的任何可换行的显示数学环境amsmath。下面我使用了，但您也alignat可以使用gather或：align

\documentclass{beamer}
\usepackage{amsmath,amssymb}
\newcommand{\mythickertimes}{\boldsymbol{\times}}
\begin{document}

\begin{frame}
\frametitle{Householder Transformation}

\begin{alignat*}{3}
  \underset{A}{\begin{pmatrix}
      \times & \times & \times \\
      \times & \times & \times \\
      \times & \times & \times \\
      \times & \times & \times 
    \end{pmatrix}}
  & \xrightarrow{(1:4,1:3)} &
  \underset{Q_1 A}{\begin{pmatrix}
      \mythickertimes & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes 
    \end{pmatrix}}
  & \xrightarrow{(2:4,2:3)} \\
  \underset{Q_1 A}{\begin{pmatrix}
      \times & \times & \times \\
      0 & \mythickertimes & \mythickertimes \\
      0 & \boldsymbol{0} & \mythickertimes \\
      0 & \boldsymbol{0} & \mythickertimes 
    \end{pmatrix}}
  & \xrightarrow{(3:4,3:3)} &
  \underset{Q_1 A}{\begin{pmatrix}
      \times & \times & \times \\
      0 & \times & \times \\
      0 & 0 & \mythickertimes \\
      0 & 0 & \boldsymbol{0} 
    \end{pmatrix}}
  & \xrightarrow{(2:4,2:3)}
  R.
\end{alignat*}
\end{frame}

\end{document}

要使用覆盖按顺序显示矩阵操作，您可以使用\onslide：请注意，您必须为环境中的每个单元单独指定覆盖alignat：

\documentclass{beamer}
\usepackage{amsmath,amssymb}
\newcommand{\mythickertimes}{\boldsymbol{\times}}
\begin{document}

\begin{frame}
\frametitle{Householder Transformation}

\begin{alignat*}{3}
  \underset{A}{\begin{pmatrix}
      \times & \times &\times \\
      \times & \times &\times \\
      \times & \times &\times \\
      \times & \times &\times 
    \end{pmatrix}}
  & \onslide<2->{\xrightarrow{(1:4,1:3)} &
  \underset{Q_1 A}{\begin{pmatrix}
      \mythickertimes & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes \\
      \boldsymbol{0} & \mythickertimes & \mythickertimes 
    \end{pmatrix}}}
  & \onslide<3->{\xrightarrow{(2:4,2:3)} \\
  \underset{Q_1 A}{\begin{pmatrix}
      \times & \times & \times \\
      0 & \mythickertimes & \mythickertimes \\
      0 & \boldsymbol{0} & \mythickertimes \\
      0 & \boldsymbol{0} & \mythickertimes 
    \end{pmatrix}}}
  & \onslide<4->{\xrightarrow{(3:4,3:3)} &
  \underset{Q_1 A}{\begin{pmatrix}
      \times & \times & \times \\
      0 & \times & \times \\
      0 & 0 & \mythickertimes \\
      0 & 0 & \boldsymbol{0} 
    \end{pmatrix}}}
  & \onslide<5->{\xrightarrow{(2:4,2:3)}
  R.}
\end{alignat*}
\end{frame}

\end{document}