[Tex/LaTex] How to change the display of subfigures in List of Figures

subcaptionsubfloatstable of contents

I'm using the subcaption package and I would like to change the display in the List of Figures of the subfigures.

Right now, it displays as :

2.1 Caption 1  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
   a      Subcaption 1 . . . . . . . . . . . . . . . . . . . . . . . . . 6
   b      Subcaption 2 . . . . . . . . . . . . . . . . . . . . . . . . . 6

I'd like it to have a display as :

2.1  Caption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
   2.1.a  Subcaption 1 . . . . . . . . . . . . . . . . . . . . . . . . . 6
   2.1.b  Subcaption 2 . . . . . . . . . . . . . . . . . . . . . . . . . 6

Is it possible to customize the display ?

Here's the a piece of code I'm using :

\documentclass{book}

\usepackage{graphicx}
\usepackage{caption}
\usepackage[list=true]{subcaption}

\begin{document}
\begin{figure}[H]
\centering
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=0.9\textwidth]{subfigure1.jpg}
\caption{subcaption 1}
\label{fig:sub1}
\end{subfigure}%
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=0.3\textwidth]{subfigure2.jpg}
\caption{subcaption 2}
\label{fig:sub2}
\end{subfigure}
\caption{Caption}
\label{fig:fig} 
\end{figure}

\end{document}

Best Answer

You could use the option listformat=..., e.g.:

\documentclass{book}

\usepackage[demo]{graphicx}
\usepackage{caption}
\usepackage[list=true,listformat=simple]{subcaption}

\begin{document}
\listoffigures

\chapter{One}
\section{One}

\begin{figure}[!ht]
\centering
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=0.9\textwidth]{subfigure1.jpg}
\caption{subcaption 1}
\label{fig:sub1}
\end{subfigure}%
\begin{subfigure}{.5\textwidth}
\centering
\includegraphics[width=0.3\textwidth]{subfigure2.jpg}
\caption{subcaption 2}
\label{fig:sub2}
\end{subfigure}
\caption{Caption}
\label{fig:fig} 
\end{figure}

\end{document}

enter image description here

If you want to have an additional dot between figure and sub-figure number, one option is creating an own list format, e.g.:

...
\usepackage{caption}
\DeclareCaptionListFormat{myfmt}{#1.#2}
\usepackage[list=true,listformat=myfmt]{subcaption}
...

enter image description here

Please note that this solution will still give you references like 1.1a as result of \ref{fig:sub1}.

To change both, the appearance of List of Figures, and the references, one better re-define \p@subcaption. For example:

...
\usepackage{caption}
\usepackage[list=true,listformat=simple]{subcaption}
\makeatletter
\g@addto@macro\p@subfigure{.}
\makeatother
...

As opposite to the last solution this one will change both to 1.1.a, i.e. having a period between figure and sub-figure part of the numbering in List of Figures and references.

(For details about listformat= and \DeclareCaptionListFormat please take a look at the caption package documentation. For details about \p@subfigure please take a look at the subcaption package documentation, section "References".)

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