I have three models that I test under different parameter configurations. I created a figure where every column corresponds to a model. I would like to add the value of the parameter at the left of every row. After reading this answer, this is what I do:
\documentclass{article}
\usepackage[draft]{graphicx}
\usepackage{subcaption}
\begin{document}
\begin{figure}
\centering
\begin{subfigure}[t]{0.30\textwidth}
\rotatebox[origin=c]{90}{$R=1$}
\includegraphics[width=\textwidth]
{test.png}
\rotatebox[origin=c]{90}{$R=2$}
\includegraphics[width=\textwidth]
{test.png}
\rotatebox[origin=c]{90}{$R=3$}
\includegraphics[width=\textwidth]
{test.png}
\caption{model A}
\end{subfigure}
\hspace{1em}
\begin{subfigure}[t]{0.30\textwidth}
\includegraphics[width=\textwidth]
{test.png}
\includegraphics[width=\textwidth]
{test.png}
\includegraphics[width=\textwidth]
{test.png}
\caption{model B}
\end{subfigure}
\hspace{1em}
\begin{subfigure}[t]{0.30\textwidth}
\includegraphics[width=\textwidth]
{test.png}
\includegraphics[width=\textwidth]
{test.png}
\includegraphics[width=\textwidth]
{test.png}
\caption{model C}
\end{subfigure}
\caption{Grid test}
\end{figure}
But I get this:
How can I make it right?