森林 - 精确垂直调整额外附加节点的文本

Question

我想调整上图中时间符号的垂直位置。

这是使用的代码。

\documentclass[12pt]{article}

\usepackage{forest}

\begin{document}

\begin{forest} 
  for tree = {math content},
  where n children = 0 {tier = word} {}
  [243
    [3   [3^1]]
    [81
      [9   [3^2]]       
      [9   [3^2]]
    ]
  ]
  \path (!11)  -- (!211) node[midway]{$\times$};
  \path (!211) -- (!221) node[midway]{$\times$};
\end{forest}

But we must have :

$3^1 \times 3^2 \times 3^2$

\end{document}

Answer 1

一种可能的解决方案是使用base锚点。例如：

\documentclass[12pt]{article}
\usepackage{forest}

\begin{document}
\begin{forest} 
  for tree = {math content},
  where n children = 0 {tier = word} {}
  [343
    [3   [3^1]]
    [81
      [9   [3^2]]       
      [9   [3^2]]
    ]
  ]
  \path (!11.base)  -- (!211.base) node[midway,anchor=base]{$\times$};
  \path (!211.base) -- (!221.base) node[midway,anchor=base]{$\times$};
\end{forest}

But we must have:

$3^1 \times 3^2 \times 3^2$
\end{document}