我想画一个图表。我用tikz 矩阵绘制顶点,然后想从数组中添加边。我尝试了以下代码:
\documentclass{article}
\usepackage{tikz,pgfmath}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}
\matrix (w) [nodes={circle,draw,scale=0.66}, matrix of nodes, row sep=2em, column sep=0.5em]{
1&2&3\\
&4&5\\
&6\\
};
\def\V{{"w-1-1","w-1-2","w-1-3","w-2-2","w-2-3","w-3-2"}}
%\draw[->] (\V[1]) to (\V[2]); %Line A
%\node at (1,1) {\pgfmathparse{\V[2]}\pgfmathresult}; %Line B
\draw[->] (\pgfmathparse{\V[1]}\pgfmathresult) to (\pgfmathparse{\V[2]}\pgfmathresult); %Line C
\end{tikzpicture}
\end{document}
我试过A 线首先,它不起作用。事实证明,为了正确访问数组,我必须使用pdfmathparse。但代码无法编译(尽管B线工作正常)。(似乎输出pgfmathresult是一个字符串,它不是什么画期望。)
PS:最初的动机是为了简洁地说明图 pebbling。无论如何,我已附上最终代码以及结果。
\documentclass{article}
\usepackage{tikz,pgfmath,xstring,algorithm}
\usetikzlibrary{matrix}
\newcommand{\Configuration}[6]{%A fixed graph
\begin{minipage}{.2\textwidth}%1
\begin{tikzpicture}
\matrix (w) [nodes={circle,draw,scale=0.6}, matrix of nodes, row sep=2em, column sep=0.5em,ampersand replacement=\&]{
1\&2\&3\\
\&4\&5\\
\&6\\
};
\def\V{{"w-1-1","w-1-2","w-1-3","w-2-2","w-2-3","w-3-2"}}%the mapping
\foreach \x/\y/\z in {{1/4/#1},{2/4/#2},{3/4/#3},{3/5/#4},{4/6/#5},{5/6/#6}}%pebbling
\pgfmathsetmacro{\X}{\V[\x-1]}
\pgfmathsetmacro{\Y}{\V[\y-1]}
\draw[->] (\X) to node {\ifthenelse{\z=0}{}{$\bullet$}} (\Y);
\end{tikzpicture}
\end{minipage}
}
\begin{document}
\begin{figure}
\centering
\Configuration{0}{0}{0}{0}{0}{0}
\Configuration{1}{0}{0}{0}{0}{0}
\Configuration{1}{1}{0}{0}{0}{0}
\Configuration{1}{1}{1}{0}{0}{0}
\Configuration{1}{1}{1}{0}{1}{0}
\Configuration{1}{1}{0}{0}{1}{0}
\Configuration{1}{0}{0}{0}{1}{0}
\Configuration{0}{0}{0}{0}{1}{0}
\Configuration{0}{0}{0}{1}{1}{0}
\Configuration{0}{0}{0}{1}{1}{1}
\Configuration{0}{0}{0}{0}{1}{1}
\end{figure}
\end{document}
答案1
不确定你想要什么,但我认为这\pgfmathsetmacro
可以解决你的问题:
\documentclass [border=2mm]{standalone}
\usepackage{tikz}
\usepackage{tikz,pgfmath}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}
\matrix (w) [nodes={circle,draw,scale=0.66}, matrix of nodes, row sep=2em, column sep=0.5em]{
1&2&3\\
&4&5\\
&6\\
};
\def\V{{"w-1-1","w-1-2","w-1-3","w-2-2","w-2-3","w-3-2"}}
\pgfmathsetmacro{\start}{\V[1]}
\pgfmathsetmacro{\finish}{\V[2]}
\draw[->] (\start) to (\finish); %Line C
\end{tikzpicture}
\end{document}