# Drawings a figure of subgraphs side-by-side with captions in Latex with TIKZ

Today, I will give an example of how to draw a figure containing three subgraphs that appear side by side in Latex using the TIKZ library, and where each subgraph has a caption. This can be useful when writing research papers, where we want to discuss different types of subgraphs.

The result will be like this:

And here is the Latex code:

\documentclass{article}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{tikz}
\usetikzlibrary{automata,arrows,positioning,calc}

\begin{document}

\begin{figure}
\begin{subfigure}[b]{0.30\textwidth}
\centering
\begin{tikzpicture}[> = stealth,  shorten > = 1pt,   auto,   node distance = 1.5cm]
\node[state] (v) {$A$};
\node[state] (w) [right of=v] {$B$};
\node[state] (t) [right of=w] {$C$};

\path[->] (v)  edge node {0} (w);
\path[->] (w) edge   node  {1}(t);
\end{tikzpicture}
\caption{Subgraph 1}
\end{subfigure}
\begin{subfigure}[b]{.30\textwidth}
\centering
\begin{tikzpicture}[> = stealth,  shorten > = 1pt,   auto,   node distance = 1.5cm]
\node[state] (x) {$E$};
\node[state] (y) [below of=x] {$F$};
\node[state] (n) [right of=x] {$G$};
\node[state] (z) [below of=y] {$H$};

\path[->] (x)  edge node {0} (y);
\path[->] (x)  edge node {0} (n);
\path[->] (n)  edge node {0} (z);
\path[->] (y) edge   node  {1}(z);
\end{tikzpicture}
\caption{Subgraph 2}
\end{subfigure}
\begin{subfigure}[b]{.30\textwidth}
\centering
\begin{tikzpicture}[> = stealth,  shorten > = 1pt,   auto,   node distance = 1.7cm]
\node[state] (g) {$A$};
\node[state] (h) [above of=g] {$B$};
\node[state] (e) [above right= 0.3 cm and 0.3 cm of g] {$C$};
\path[->] (g)  edge node {} (e);
\path[->] (g)  edge node {} (h);
\path[->] (h) edge   node  {}(e);
\end{tikzpicture}
\caption{Subgraph 3}
\end{subfigure}
\caption{Three subgraphs}
\end{figure}

In this code, I use the automata package of TIKZ, which is great for drawing graphs. You could also use other packages and tweak the above example.

Hope this is useful.

Philippe Fournier-Viger is a distinguished professor working in China and founder of the SPMF open source data mining software.

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