# Arrange multiple graphics inside a subfloat

I'm using the subfig package to arrange multiple graphics inside a figure. I'm trying to arrange two graphics vertically inside a subfloat but keep getting an error. I'd like the figures to be arranged something like this:

 _____   _____
|_____| |     |
_____  |     |
|_____| |_____|
(a)     (b)


But when I try

\begin{figure}
\centering
\subfloat[][]{
\includegraphics{graph1} \\
\includegraphics{graph2}
}
\subfloat[][]{
\includegraphics{graph3}
}
\end{figure}


I get the error Something's wrong--perhaps a missing \item. If I remove the linebreak inside the subfloat the error goes away but then my figures aren't arranged right. How should I be doing this?

Here's one option using the subfigure environment from the subcaption package and taking advantage of the optional arguments for the environment (the same as those for a minipage); depending on the actual size of your images, you might need to adjust some lengths: :

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{subcaption}

\begin{document}

\begin{figure}
\centering
\begin{subfigure}[b][6.5cm][b]{.3\textwidth}
\centering
\includegraphics[width=3cm,height=3cm]{smallfigure1}\\\vfill
\includegraphics[width=3cm,height=2cm]{smallfigure2}
\caption{Two small subfigures}
\end{subfigure}%
\begin{subfigure}[b][6.5cm][b]{.3\textwidth}
\centering
\includegraphics[width=3cm,height=6cm]{largefigure}
\caption{A large subfigure}
\end{subfigure}
\caption{three subfigures}
\end{figure}

\end{document}


The demo option for graphicx simply replaces actual figures with black rectangles; do not use that option in your actual document.

And here's an option using the subfig package and some minipages:

\documentclass{article}
\usepackage[demo]{graphicx}
\usepackage{subfig}

\begin{document}

\begin{figure}
\centering
\subfloat[Two small subfigures]{%
\begin{minipage}[b][6.5cm][t]{.3\textwidth}
\centering
\includegraphics[width=3cm,height=2cm]{smallfigure1}

\vfill
\includegraphics[width=3cm,height=2cm]{smallfigure2}
\end{minipage}}%
\subfloat[A larger subfigure]{\begin{minipage}[b][6.5cm][t]{.3\textwidth}
\centering
\includegraphics[width=3cm,height=6.5cm]{largefigure}
\end{minipage}}
\caption{three subfigures}
\end{figure}

\end{document}


You can box the larger image and measure its height to use this value for the minipages height. The mechanism is explained in Aligning 3 images square in a box

• Is there any way to do this with subfig? – David P May 15 '13 at 2:02
• @DavidP Sure! Please see my updated answer. – Gonzalo Medina May 15 '13 at 3:00