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在决策树分支上添加短线

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在决策树分支上添加短线

我正在使用“森林”包创建决策树，并想在分支上添加短线以表明决策不是最优的。这可以在“森林”中完成吗？我附上了一本书中的样本图。

如果无法实现完全这种外观，我会对接近的替代解决方案感兴趣。

在此处输入图片描述

编辑：根据要求，这里是树的一般结构的示例代码（与扫描版本不太一样，并且省略了一些数字）。

\documentclass{beamer}

\usepackage{tikz}
\usetikzlibrary{trees,shapes,snakes}
\usepackage{forest}


\tikzset{
    decision/.style={rectangle, minimum height=10pt, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
    chance/.style={circle, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
    leaf-chance/.style={isosceles triangle, minimum width=10pt, draw=black, thick, fill=white, inner sep=0pt, shape border rotate=180, outer sep=-\pgflinewidth}
  }

\begin{document}


\begin{frame}[fragile]

\scalebox{0.85}{
 \begin{forest}
   my label/.style={
      edge label={node[auto, sloped,pos=.75,anchor=south]{#1}}
    },
    for tree={
      grow=0,
      child anchor=west,
      anchor=west,
      text ragged,
      inner sep=1mm,
      edge={thick, draw=blue},
      l sep+=30mm,
      s sep+=5mm,
      if n children=0{
        before typesetting nodes={
          label/.wrap pgfmath arg={right:#1}{content()},
          content={},
          leaf-chance,
        },
      }{},
      edge path={
       \noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) |- (.child anchor)\forestoption{edge label};
       % alternatively, with angled lines
        %\noexpand\path[\forestoption{edge}]
        % (!u.parent anchor) -- ([xshift=-2.6cm].child anchor) --    
        % (.child anchor)\forestoption{edge label};
  },
    }
    [,decision
      [0.8351,chance,my label=Insure]
      [,chance,my label=Don't Insure        
        [0.8394,chance,my label=No outbreak
        ]
        [,chance,my label=Outbreak
          [0.8334,chance,my label=Bans only
          ]
          [0.6663,chance,my label=Slaughter
          ]
        ]
      ]
    ]
\end{forest}
}

\end{frame}
\end{document}

在此处输入图片描述

答案1

以下是基于我发布的代码回答您之前的一个问题。sub optimal穿过树的相关分支。

\documentclass[tikz,border=5pt]{standalone}
\usepackage{forest}
\usetikzlibrary{shapes}

\tikzset{
  decision/.style={rectangle, minimum height=10pt, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
  chance/.style={circle, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
  leaf-chance/.style={isosceles triangle, minimum width=10pt, draw=black, thick, fill=white, inner sep=0pt, shape border rotate=180, outer sep=-\pgflinewidth}
}
\newsavebox\notgood
\sbox\notgood{\textbardbl}
\forestset{
  declare toks={optimality}{},
  sub optimal/.style={
    optimality={
      node [midway, sloped] {\usebox\notgood}
    }
  }
}

\begin{document}
\begin{forest}
   my label/.style={
     edge label={node[auto, pos=1, anchor=south east]{#1}}
   },
   for tree={
     grow=0,
     child anchor=west,
     anchor=west,
     text ragged,
     inner sep=1mm,
     edge={thick, draw=blue, rounded corners=2pt},
     s sep+=5mm,
     l sep+=30mm,
     if n children=0{
       if n=1{my label=Accident}{my label=No Accident},
       before typesetting nodes={
         label/.wrap pgfmath arg={[align=right, text width=25pt]right:#1}{content()},
         content={},
         leaf-chance,
       },
     }{
       if level=2{
         chance,
         if n=1{my label=Fast}{my label=Slow}
       }{decision}
     },
     edge path={
       \noexpand\path[\forestoption{edge}]
       (!u.parent anchor) -- ([xshift=-22.5mm].child anchor)\forestove{optimality} --  (.child anchor)\forestoption{edge label};
     }
   }
    [
      [,my label=Route 1, sub optimal
        [
           [-900]
           [100]
        ]
        [
           [-700]
           [50]
        ]
      ]
      [,my label=Route 2
        [
           [-600]
           [80]
        ]
        [
           [-500]
           [70]
        ]
      ]
    ]
\end{forest}
\end{document}

非最优性

答案2

这是一个如何划掉树枝的简单例子。

\documentclass{article}
\usepackage{forest}
\usepackage{mathtools}
\newcommand{\verteq}{\rotatebox{90}{$=$}}
\begin{document}
\begin{forest}
crossed/.style={edge label={node[midway, sloped]{$\verteq$}}}
[A [B [C,crossed ] [D ] ] [E,crossed ] [F,crossed ]]
\end{forest}

\end{document}

代码输出

答案3

谢谢@cfr 和@AlanMunn。我已将@cfr 的答案改编为原始决策树。

\documentclass{beamer}

\usepackage{tikz}
\usetikzlibrary{trees,shapes,snakes}
\usepackage{forest}


\tikzset{
    decision/.style={rectangle, minimum height=10pt, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
    chance/.style={circle, minimum width=10pt, draw=black, fill=black!30!white, thick, inner sep=0pt},
    leaf-chance/.style={isosceles triangle, minimum width=10pt, draw=black, thick, fill=white, inner sep=0pt, shape border rotate=180, outer sep=-\pgflinewidth}
  }

\newsavebox\notgood
\sbox\notgood{\textbardbl}
\forestset{
  declare toks={optimality}{},
  sub optimal/.style={
    optimality={
      node [midway, sloped] {\usebox\notgood}
    }
  }
}

\begin{document}


\begin{frame}[fragile]

\scalebox{0.85}{
 \begin{forest}
   my label/.style={
      edge label={node[auto, sloped,pos=.75,anchor=south]{#1}}
    },
    for tree={
      grow=0,
      child anchor=west,
      anchor=west,
      text ragged,
      inner sep=1mm,
      edge={thick, draw=blue},
      l sep+=30mm,
      s sep+=5mm,
      if n children=0{
        before typesetting nodes={
          label/.wrap pgfmath arg={right:#1}{content()},
          content={},
          leaf-chance,
        },
      }{},
      edge path={
        \noexpand\path[\forestoption{edge}]
       (!u.parent anchor) -- ([xshift=-22.5mm].child anchor)\forestove{optimality} --  (.child anchor)\forestoption{edge label};
  },
    }
    [,decision
      [0.8351,chance,my label=Insure]
      [,chance,my label=Don't Insure, sub optimal      
        [0.8394,chance,my label=No outbreak
        ]
        [,chance,my label=Outbreak
          [0.8334,chance,my label=Bans only
          ]
          [0.6663,chance,my label=Slaughter
          ]
        ]
      ]
    ]
\end{forest}
}

\end{frame}
\end{document}

在此处输入图片描述

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