How can I have images that are side-by-side and have numbers attached to each one?

Question

For example:

*Image 1* *Image 2* *Image 3*
   (i)       (ii)     (iii)
 Figure n. Multiple images. (i) image at time n. (ii) Image at time n+1. (iii) Image at time n+2

Answer 1

I use subfigure for this. Here's a blog post that describes its usage. In summary (taken from the post),

\begin{figure}
 \subfigure[Caption of subfigure 1]{
  % content of subfigure 1
  \label{fig:subfig1}
 }
 % repeat subfigure as necessary
 \label{fig:labelForFullFigure}
 \caption{Caption of subfigures \subref{fig:subfig1}, \subref{fig:subfig2} and \subref{fig:subfig3}}
\end{figure}

An alternative would be subfig. The documentation on CTAN (linked) shows its usage.

Answer 2

There are several packages available to achieve that:

• subcaption, belonging to the very good caption package
• subfig
• subfigure, older than subfig and some consider it as obsolete

Here's an example using subcaption:

\documentclass{article}
\usepackage{caption}
\usepackage{subcaption}
\renewcommand\thesubfigure{\roman{subfigure}}
\usepackage[demo]{graphicx}
\begin{document}
\begin{figure}
\begin{minipage}[b]{.3\linewidth}
\centering%
\includegraphics[width=100pt]{test}
\subcaption{First image}\label{fig:1a}
\end{minipage}%
\hfill%
\begin{minipage}[b]{.3\linewidth}
\centering%
\includegraphics[width=100pt]{test}
\subcaption{Second image}\label{fig:1b}
\end{minipage}
\hfill%
\begin{minipage}[b]{.3\linewidth}
\centering%
\includegraphics[width=100pt]{test}
\subcaption{Third image}\label{fig:1b}
\end{minipage}
\caption{Multiple images}\label{fig:1}
\end{figure}
\end{document}

Output: