如何显示数组及其下方的索引

Question

我正在尝试绘制一个数组，但数组下方也有索引。目前，我只有这个

这是我的代码：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}

\begin{figure}
\centering
  \begin{tikzpicture}
    \coordinate (s) at (0,0);
    \foreach \num in {3, 1, 4, 1, 5}{
      \node[minimum size=6mm, draw, rectangle] at (s) {\num};
      \coordinate (s) at ($(s) + (1,0)$);
    }
  \end{tikzpicture}
\label{fig:testArray}
\end{figure}
\end{document}

任何帮助将不胜感激！

Answer 1

这可能会产生预期的结果：

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

\newcounter{index}

\begin{document}

\begin{figure}
\centering
  \begin{tikzpicture}
    \setcounter{index}{0}
    \coordinate (s) at (0,0);
    \foreach \num in {3, 1, 4, 1, 5}{
      \node[minimum size=6mm, draw, rectangle] at (s) {\num};
      \node at ($(s)-(0,0.5)$) {\theindex};
      \stepcounter{index}
      \coordinate (s) at ($(s) + (1,0)$);
    }
  \end{tikzpicture}
  \label{fig:testArray}
\end{figure}
\begin{figure}
\centering
  \begin{tikzpicture}
    \setcounter{index}{0}
    \coordinate (s) at (0,0);
    \foreach \num in {2, 7, 1, 8, 2}{
      \node[minimum size=6mm, draw, rectangle] at (s) {\num};
      \node at ($(s)-(0,0.5)$) {\theindex};
      \stepcounter{index}
      \coordinate (s) at ($(s) + (1,0)$);
    }
  \end{tikzpicture}
  \label{fig:testArray2}
\end{figure}
\end{document}

编辑：我稍微重组了代码，以减少出现错误的可能性。