Beamer：TikZ节点矩阵，其中一个节点有多条线

Question

我正在尝试构建一个具有两列和多行的矩阵。顶行有两个节点，它们都需要保存多行文本和数学。当我按照规定的方法使用花括号括起多行单元格时\\，我根本无法编译代码（texmaker 永远运行，我的机器变得非常热，我不得不关闭应用程序）。任何帮助都将不胜感激。

\documentclass{beamer}
\mode<presentation>
{
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
}

\usepackage{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{matrix,overlay-beamer-styles}

%%%%%%%%%
\usetikzlibrary{calc}
%%%%%%%%
\tcbuselibrary{theorems}


\newtcbtheorem[]{mylemmma}{Lemma}{colframe=green,colback=white, width=\textwidth}{lem}
\tcbset{colframe=green, colback=white}  
\resetcounteronoverlays{tcb@cnt@mylemmma}

\begin{document}
\section{Proofs}
\newtcbtheorem[]{mydef}{Problem Statement}{colframe=white, colback=white}{ps}
\tcbset{colframe=black, colback=white}              

\resetcounteronoverlays{tcb@cnt@mydef}

\begin{frame}[fragile]
\centering
\begin{tikzpicture}[optimization problem/.style = {%
            rounded corners, 
            draw = blue,
            thick,
            fill= yellow,
            inner ysep=5pt,
            inner xsep=5pt,
            align = center},
            myplainproblem/.style = {%
            rounded corners, 
            draw = blue,
            thick,
            fill= white,
            inner ysep=5pt,
            inner xsep=5pt,
            align = center},
            ]

\matrix[matrix of nodes,row sep=1em,column sep=1em,
    nodes={anchor=west,optimization problem,
    visible on=<\the\numexpr\pgfmatrixcurrentcolumn+2*\pgfmatrixcurrentrow-2\relax->,},
     column 1/.style={nodes={myplainproblem,
     }},
     column 2/.style={nodes={myplainproblem,
     }}, 
     row 1/.style={nodes={optimization problem,
     }}, 
    ](M){
    vectors   &  matrices \\
    reason 1    & matrix reason 1\\
    reason 2    & matrix reason 2\\
};          

\end{tikzpicture}

\end{frame}
\end{document}

Answer 1

当我们查看 pgfmanual v3.1.5 中相应部分时60.2 节点矩阵中的行尾和行末字符，人们发现在示例中text width设置了。它确实提到

仅当您使用节点的文本宽度选项时才会出现此问题。

但我同意，这是否意味着必须设置才能text width使花括号技巧发挥作用这一点并不明确。无论如何，一旦我们设置了它，它就会起作用。

\documentclass{beamer}
\mode<presentation>
{
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
}

\usepackage{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{matrix,overlay-beamer-styles}

%%%%%%%%%
\usetikzlibrary{calc}
%%%%%%%%
\tcbuselibrary{theorems}


\newtcbtheorem[]{mylemmma}{Lemma}{colframe=green,colback=white, width=\textwidth}{lem}
\tcbset{colframe=green, colback=white}  
\resetcounteronoverlays{tcb@cnt@mylemmma}

\begin{document}
\section{Proofs}
\newtcbtheorem[]{mydef}{Problem Statement}{colframe=white, colback=white}{ps}
\tcbset{colframe=black, colback=white}              

\resetcounteronoverlays{tcb@cnt@mydef}

\begin{frame}[fragile]
\centering
\begin{tikzpicture}[optimization problem/.style = {%
            rounded corners, 
            draw = blue,
            thick,
            fill= yellow,
            inner ysep=5pt,
            inner xsep=5pt,
            align = center},
            myplainproblem/.style = {%
            rounded corners, 
            draw = blue,
            thick,
            fill= white,
            inner ysep=5pt,
            inner xsep=5pt,
            align = center},
            ]

\matrix[matrix of nodes,row sep=1em,column sep=1em,
    nodes={anchor=west,optimization problem,text width=8em,
    visible on=<\the\numexpr\pgfmatrixcurrentcolumn+2*\pgfmatrixcurrentrow-2\relax->,},
     column 1/.style={nodes={myplainproblem,
     }},
     column 2/.style={nodes={myplainproblem,
     }}, 
     row 1/.style={nodes={optimization problem,
     }}, 
    ](M){
    {vectors\\ tensors}   &  {matrices\\ tableaux} \\
    reason 1    & matrix reason 1\\
    reason 2    & matrix reason 2\\
};          

\end{tikzpicture}

\end{frame}
\end{document}

如果你觉得手册在这里可以更清楚（我当然同意这个说法），你可以提交一个问题。