LaTeX Assistant

Documentation	subcaption
Categories	figures
Description	The subcaption package allows you to add separate captions to parts of a multipart figure or table. It supersedes older packages such as subfig and subfigure.
Options	\usepackage{subcaption} % Use subcaption to add separate captions to parts of a multipart fig/table
Examples

The example below shows how to create a figure with two subfigures. Each subfigure is drawn by tikz, but you can also use \includegraphics[options]{filename}

\begin{figure}[tb]
    \centering
        \subcaptionbox{a microstate\label{fig:amicrostate}}{
            \begin{tikzpicture}[scale=1]
                \def\x{3}
                \def\y{3}
                \draw[dashed] (0,0) -- (0,\y);
                \draw[line width=4pt,color=SlateGray] (-\x,0) rectangle (\x,\y);
                \foreach \x/\y/\n in {-2/2.5/1, 1/2.3/2, -0.7/1.3/3,
                                      -2.5/0.4/4, 1/1.4/5, 2.6/0.8/6, -2.2/2/7} {
                  \node[draw,circle,inner sep=2pt,fill=yellow!20] at (\x,\y) {\n};
                }
              \end{tikzpicture}
        }
        \qquad
        \subcaptionbox{a macrostate\label{fig:amacrostate}}{
            \begin{tikzpicture}[scale=1]
                \def\x{3}
                \def\y{3}
                \draw[dashed] (0,0) -- (0,\y);
                \draw[line width=4pt,color=SlateGray] (-\x,0) rectangle (\x,\y);
                \foreach \x/\y/\n in {-2/2.5/1, 1/2.3/2, -0.7/1.3/3,
                                     -2.5/0.4/4, 1/1.4/5, 2.6/0.8/6, -2.2/2/7} {
                  \node[draw,circle,inner sep=2pt,fill=yellow!20] at (\x,\y) {\phantom{\n}};
                }
                \node[anchor=south] at (-\x/3,0.1) {$N-r$};
                \node[anchor=south] at (\x/3,0.1) {$\vphantom{N}r$};
              \end{tikzpicture}
        }
    \caption[Microstates and macrostates of a gas]{
    (a) A microstate of the gas in the box having $r$ molecules on 
    the right half of the box and $N-r$ molecules on the left. Note that 
    we obtain a different microstate on permuting any pair of molecules 
    of which one is on the left and the other is on the right. (b) The 
    corresponding macrostate. It is characterized solely by having $r = 
    3$ molecules on the right, and $N-r=4$ molecules on the left. 
    }
    \label{fig:boltzbeetleA}
\end{figure}

By default, the letter of the subfigure is tacked onto the figure number (Fig. 3a). If you want the subfigure designation to be set off in parentheses (Fig. 3(a)), load the package with the following code:

\usepackage[labelformat=simple]{subcaption}
\renewcommand\thesubfigure{(\alph{subfigure})}

The subcaption Package