程式碼

Question

我正在努力理解如何將節點放在伯努利試驗樹的第一層的分支上。當我嘗試將其繪製出來時，分支中心的節點標籤成為我的子節點的起點。有人可以提供一些建議嗎？

謝謝！

\documentclass{article}
\usepackage[margin = 1in]{geometry}
\usepackage{amsfonts}
\usepackage{amsthm, amsmath, amssymb}
\usepackage{tikz}
\usepackage{pgfplots}

\usetikzlibrary{arrows,decorations.pathmorphing,backgrounds,positioning,fit,petri}
\usepgfplotslibrary{statistics}

\begin{document}
\begin{tikzpicture}
 [font=\footnotesize,
       grow=right, level 1/.style={sibling distance=6em},
level 2/.style={sibling distance=1em}, level distance=5cm] 
\node (Root) {} % root
 child { node {s} edge from parent node [below = .25cm] {$\frac{1}{2}$}
    child { node {s} edge from parent node [above = .25cm] {$\frac{1}{2}$}} 
    child { node {f} edge from parent node [below = .25cm] {$\frac{1}{2}$}}
 }
 child { node {f}
    child { node {s} edge from parent node [above = .25cm] {$\frac{1}{2}$}} 
    child { node {f} edge from parent node [below = .25cm] {$\frac{1}{2}$}}
};
\end{tikzpicture}
\end{document}

Answer 1

在 TikZ 樹中，要修改從父節點（例如P）到其子節點（例如C1）的分支（例如更改其顏色、添加文字和/或其他樣式），您必須將鍵放在所有子節點和孫子節點edge from parent之後C1的C1。

程式碼

\documentclass{article}
\usepackage[margin = 1in]{geometry}
\usepackage{amsfonts}
\usepackage{amsthm, amsmath, amssymb}
\usepackage{tikz}
\usepackage{pgfplots}

\usetikzlibrary{arrows,decorations.pathmorphing,backgrounds,positioning,fit,petri}
\usepgfplotslibrary{statistics}

\begin{document}
\begin{tikzpicture}
 [font=\footnotesize,
       grow=right, level 1/.style={sibling distance=6em},
level 2/.style={sibling distance=1em}, level distance=5cm] 
\node (Root) {} % root
 child { node {s} 
    child { node {s} edge from parent node [above = .25cm] {$\frac{1}{2}$}} 
    child { node {f} edge from parent node [below = .25cm] {$\frac{1}{2}$}}
    edge from parent node [below = .25cm] {$\frac{1}{2}$} % NEW
 }
 child { node {f}
    child { node {s} edge from parent node [above = .25cm] {$\frac{1}{2}$}} 
    child { node {f} edge from parent node [below = .25cm] {$\frac{1}{2}$}}
    edge from parent node [above = .25cm] {$\frac{1}{2}$} % NEW
};
\end{tikzpicture}
\end{document}

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