提取 tikzpicture 矩阵维度

Question

如果我有这个矩阵代码，

  \begin{tikzpicture}
  \matrix[matrix of math nodes, anchor=south west,
  nodes={
  draw=red,
  align=center, 
  inner sep=0pt,
  text width=1cm - \pgflinewidth,
  minimum size = 1cm - \pgflinewidth
  }
  ]{
    A & B & D & B & A & C & E & G & E & H & E & C & F & I & F & C & A \\
    0 & 1 & 2 & 1 & 0 & 1 & 2 & 3 & 2 & 3 & 2 & 1 & 2 & 3 & 2 & 1 & 0 \\
  };
 \end{tikzpicture}

有没有办法从某些变量“m”（表示行）和“n”（表示列）中提取矩阵维度，而无需手动计算它们？

Answer 1

事实上，这非常简单。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}
  \noindent\begin{tikzpicture}
  \matrix[matrix of math nodes, anchor=south west,
  nodes={
  draw=red,
  align=center, 
  inner sep=0pt,
  text width=0.5cm - \pgflinewidth,
  minimum size = 0.5cm - \pgflinewidth
  }
  ]{
    A & B & D & B & A & C & E & G & E & H & E & C & F & I & F & C & A \\
    0 & 1 & 2 & 1 & 0 & 1 & 2 & 3 & 2 & 3 & 2 & 1 & 2 & 3 & 2 & 1 & 0 \\
  };
 \end{tikzpicture}

\the\pgfmatrixcurrentrow{ by }\the\pgfmatrixcurrentcolumn
\end{document}