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PGF 数学错误，forrest 中出现空白节点

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PGF 数学错误，forrest 中出现空白节点 
\documentclass[12pt]{article}

\usepackage{forest}

\usepackage{gb4e,cgloss}



\forestset{

sn edges/.style={for tree={parent anchor=south, child anchor=north,align=center,base=bottom{}}},

background tree/.style={for tree={text opacity=0.2,draw opacity=0.2,}},   

qtree/.style={
baseline,
for tree={
  parent anchor=south,
  child anchor=north,
  align=center,
  inner sep=1pt,
}},

nice empty nodes/.style={for tree={calign=fixed edge angles},delay={where content={}{shape=coordinate,for parent={for children={anchor=north}}}{}}}

}


\begin{document}


\begin{exe}

\ex

\begin{forest} qtree, nice empty nodes,  

[…, for descendants={l=0}, name=dots , tikz={\node [draw,green,inner sep=12pt, fit=(V)(dots)(book)(Erel)(v)(T)] {};}
[ \emph{v}P
    [DP
        [Erel, triangle, name=Erel ] ]
    [ {}, s sep=5em
        [VP, name=VP, tikz={\node [draw,red,fit to tree] {};}
                [DP
                    [ book-ACC, name=book, triangle ] ] 
                [V\\buy, name=V] ] 
        [\emph{v}, name=v ] ] ]
[T, name=T ] ]

\node at (dots)[above=5ex]{{\bf CP-phase}};

\node at (VP)[below=17ex]{{\bf VP-phase}}; name=VPnod

\end{forest}

\end{exe}

这给了我以下错误信息：

./divide with zero.tex:39: Package PGF Math Error: You asked me to calculate `1

/0.0', but I cannot divide any number by zero.


See the PGF Math package documentation for explanation.

Type  H <return>  for immediate help.

 ...                                              


l.39 \end{forest}

但是，如果我将 vP 下的空节点更改为任何内容，错误就会消失。

答案1

我已使用 @Jason 链接的问题中的注释来编辑代码以解决问题。下面的代码解决了 pgf 的问题，但在空白节点处留下了一些空白，分支几乎连接在那里。在特定环境（forest而不是整个文档）本地使用以下命令，您仍然可以对文档中的所有其他树使用 nice empty nodes 命令。

calign=fixed edge angles ,delay={where content={}{shape=rectangle, inner sep=0pt, outer sep=0pt ,for parent={for children={anchor=north}}}{}}


\begin{exe}
\ex
\begin{forest} qtree, calign=fixed edge angles ,delay={where content={}{shape=rectangle, inner sep=0pt, outer sep=0pt ,for parent={for children={anchor=north}}}{}}, 
[\ldots, for descendants={l=0}, name=dots , tikz={\node [draw,green,inner sep=12pt, fit=(V)(dots)(book)(Erel)(v)(T)] {};}
    [ \emph{v}P, s sep=22pt
        [DP
            [Erel, triangle, name=Erel ] ]
        [ {}, s sep=30pt
            [VP, name=VP, tikz={\node [draw,red,fit to tree] {};}
                    [DP
                        [ book-ACC, name=book, triangle ] ] 
                    [V\\buy, name=V] ] 
            [\emph{v}, name=v ] ] ]
    [T, name=T ] ]
\node at (dots)[above=5ex]{{\bf CP-phase}};
\node at (VP)[below=13ex]{{\bf VP-phase}}; name=VPnod
\end{forest}
\end{exe}

这是最终结果。如你所见，空白节点分支到 VP，五与母节点的分支没有完全连接五磷

在此处输入图片描述

编辑：有关同一类型问题的最新帖子，请参阅这里。此解决方案处理示例编号，并将其设置为与树中的最高节点对齐，而不是与节点ldots对齐

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