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.