我想使用循环创建并标记边，\foreach以避免在创建大型图时必须写入每个节点/边。当我使用它创建节点时，它工作正常，但当我尝试使用变量标记边时，它停止工作。
我在这里给出了一个我想要绘制的示例，以及我尝试编写它的方式。我同时包括了使用引号符号和通常符号的尝试。当我将它们放在边缘标签应该在的位置node[]{}时，我收到未定义的控制序列错误。\x
我正在使用具有分层布局的图形绘制来绘制图形，我更喜欢一种可以继续使用它的解决方案，或者至少是一些等效的东西，以一种好的方式自动定位节点和边。
% !TeX program = lualatex
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{graphs, graphdrawing, calc, quotes}
\usegdlibrary{layered}
\begin{document}
What I want in the end:
\begin{tikzpicture}[layered layout, nodes={circle,draw},level pre sep=1cm,every edge quotes/.style={auto,font=\footnotesize, draw=none, inner sep=0.1em}, horizontal=a to b ]
\node (a) {a};
\node (b) {b};
\foreach \x in {1,2,3}
{
\node (a\x) {$ a^\x $};
}
\draw (a) edge ["1" ,->] (a1);
\draw (a1) edge [->] node[every edge quotes]{$a^1 $} (b);
\draw (a) edge ["2" ,->] (a2);
\draw (a2) edge [->] node[every edge quotes]{$ a^2 $} (b);
\draw (a) edge ["3" ,->] (a3);
\draw (a3) edge [->] node[every edge quotes]{$ a^3 $} (b);
\end{tikzpicture}
How I tried to write it:
\begin{tikzpicture}[layered layout, nodes={circle,draw},level pre sep=1cm,every edge quotes/.style={auto,font=\footnotesize, draw=none, inner sep=0.1em}, horizontal=a to b ]
\node (a) {a};
\node (b) {b};
\foreach \x in {1,2,3}
{
\node (a\x) {$ a^\x $};
\draw (a) edge ["\x" ,->] (a\x);
\draw (a\x) edge [->] node[every edge quotes]{$ a^{\x} $} (b);
}
\end{tikzpicture}
\end{document}
答案1
欢迎来到不断膨胀的宇宙！这些都是膨胀问题。你可以用 pgfplots 来解决它们。
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{graphs, graphdrawing, calc, quotes}
\usegdlibrary{layered}
\begin{document}
What I want in the end:
\begin{tikzpicture}[layered layout, nodes={circle,draw},level pre sep=1cm,every edge quotes/.style={auto,font=\footnotesize, draw=none, inner sep=0.1em}, horizontal=a to b ]
\node (a) {a};
\node (b) {b};
\foreach \x in {1,2,3}
{
\node (a\x) {$ a^\x $};
}
\draw (a) edge ["1" ,->] (a1);
\draw (a1) edge [->] node[every edge quotes]{$a^1 $} (b);
\draw (a) edge ["2" ,->] (a2);
\draw (a2) edge [->] node[every edge quotes]{$ a^2 $} (b);
\draw (a) edge ["3" ,->] (a3);
\draw (a3) edge [->] node[every edge quotes]{$ a^3 $} (b);
\end{tikzpicture}
How I tried to write it:
\begin{tikzpicture}[layered layout, nodes={circle,draw},level pre sep=1cm,every edge quotes/.style={auto,font=\footnotesize, draw=none, inner sep=0.1em}, horizontal=a to b ]
\node (a) {a};
\node (b) {b};
\foreach \X in {1,2,3}
{
\edef\temp{\noexpand\node (a\X) {$ a^\X $};}
\temp
\edef\temp{\noexpand\draw (a) edge ["\X" ,->] (a\X);}
\temp
\edef\temp{\noexpand\draw (a\X)
edge [->] node[every edge quotes]{$ a^{\X} $} (b);}
\temp
}
\end{tikzpicture}
\end{document}
