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来自空节点的tikz矩阵箭头不是水平的

tag-icon • tag-icon tikz-pgf beamer
来自空节点的tikz矩阵箭头不是水平的

一开始我想问为什么矩阵在投影仪中会混乱，然后@percusse给出说明让它正确运行。

现在剩下的问题是之前的两个箭头c4似乎c7不是水平的，有办法修复它吗？

在此处输入图片描述

\documentclass{standalone}
%\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}
%\begin{frame}[fragile]
\begin{tikzpicture}
  \matrix (m) [matrix of math nodes,row sep=3em,column sep=4em,minimum width=2em]
  {
      c_0 & c_1 & c_2 & c_3 \\
      {} & c_4 & c_5 & c_6 \\
      {} & c_7 & c_8 &     &     \\
  };

  \path[-stealth]
      (m-1-1) edge node [above] {$a_0$} (m-1-2)
      (m-1-2) edge node [above] {$a_1$} (m-1-3)
      (m-1-3) edge node [above] {$a_2$} (m-1-4)
      (m-2-1) edge node [above] {$a_3$} (m-2-2)
      (m-2-2) edge node [above] {$a_4$} (m-2-3)
      (m-2-3) edge node [above] {$a_5$} (m-2-4)
      (m-3-1) edge node [above] {$a_6$} (m-3-2)
      (m-3-2) edge node [above] {$a_7$} (m-3-3);
\end{tikzpicture}
%\end{frame}
\end{document}

答案1

在此处输入图片描述

在第一列中使用幻像节点并删除最后一行中多余的“&”符号：

\documentclass{beamer}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}
\begin{frame}[fragile]
\begin{tikzpicture}
  \matrix (m) [matrix of math nodes,row sep=3em,column sep=4em,
               minimum width=2em]
  {
      c_0               & c_1 & c_2 & c_3 \\
      {\phantom{c_0}}   & c_4 & c_5 & c_6 \\
      {\phantom{c_0}}   & c_7 & c_8 &     \\
  };

  \path[-stealth]
      (m-1-1) edge node [above] {$a_0$} (m-1-2)
      (m-1-2) edge node [above] {$a_1$} (m-1-3)
      (m-1-3) edge node [above] {$a_2$} (m-1-4)
      (m-2-1) edge node [above] {$a_3$} (m-2-2)
      (m-2-2) edge node [above] {$a_4$} (m-2-3)
      (m-2-3) edge node [above] {$a_5$} (m-2-4)
      (m-3-1) edge node [above] {$a_6$} (m-3-2)
      (m-3-2) edge node [above] {$a_7$} (m-3-3);
\end{tikzpicture}
\end{frame}
\end{document}

或用于箭头起始坐标(m-1-1.east |- m-2-2)和(m-1-1.east |- m-3-2)：

  \path[-stealth]
      (m-1-1) edge node [above] {$a_0$} (m-1-2)
      (m-1-2) edge node [above] {$a_1$} (m-1-3)
      (m-1-3) edge node [above] {$a_2$} (m-1-4)
      (m-1-1.east |- m-2-2) edge node [above] {$a_3$} (m-2-2)
      (m-2-2) edge node [above] {$a_4$} (m-2-3)
      (m-2-3) edge node [above] {$a_5$} (m-2-4)
      (m-1-1.east |- m-3-2) edge node [above] {$a_6$} (m-3-2)
      (m-3-2) edge node [above] {$a_7$} (m-3-3);

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