[Tex/LaTex] (Beamer) Numbering captions by section in beamer

beamercaptionsfloatsnumbering

I'm writing-up a lecture course in LaTeX with an essentially identical set of slides in beamer. I'd like to have the figure numbering in the beamer slides to match those of the lecture notes, for the sake of consistency in cross-referencing.

The lecture notes are written in the article document style (in particular there are no chapters), and have figures numbered by section (i.e. \section.\figure). Is there some simple preamble-trick or workaround that will change the way that the captions are produced in beamer to number them consistently with the lecture notes?

I'm trying to avoid having to write a new macro to use in the main body, since I'm compiling the notes and slides from the same set of source-files using \input.

Best Answer

It's actually very easy, though I had to read the manual for a while. Add these lines to your preamble:

\setbeamertemplate{caption}[numbered]
\numberwithin{figure}{section}

The first line uses another template for captions, one that inserts the figure's number. Luckily this functionality is already built into beamer.

The second line declares that the figure counter is subordinate to the section counter, so resets for each new \section and labels figures 1.1, 1.2, ..., 2.1, 2.2, .... This is built into LaTeX.

That's it!

Related Solutions

[Tex/LaTex] Lyx cross refernce to figures not working when there is a new line between caption and label

When you mention "hyperlink to the figure", I assume you're referring to the hyperlink from the LoF. Yes, that's all based on the \caption, which is set correctly. However, as is clear from your example code, inserting a newline in LyX actually creates a separate group around the caption:

\begin{figure}[h]
\noindent \begin{centering}
\includegraphics[<opts>]{<filename>}\caption{<caption>}

\par\end{centering}

\noindent \centering{}\label{<label>}
\end{figure}

From the above we can see that \caption is placed inside a centering group. Now, according to Understanding how references and labels work you'll see that \label uses \@currentlabel - a macro that is updated when you step a counter. In this case the counter is stepped as part of the call to \caption. However, this update is reverted when the group is closed, because the update is only local to the group that its used in.

So it seems you should NOT put an empty line between the \caption and \label in LyX. It's just the way LyX interprets new lines within structures that seems strange. Of course, as a GUI-like editor for LaTeX, it attempts to remove some of the code-like insertions from the user. However, with this intuitiveness comes some assumptions... something that is clearly incorrectly interpreted in this case.

Beamer subfig captions without prefixes

Like the following image?

With \subcaptionbox defined in the subcaption package:

\documentclass{beamer}
\setbeamerfont{subcaption}{size=\tiny}
\usepackage{subcaption}
\captionsetup[subfigure]{skip=0.5ex, labelformat=empty}

\begin{document}
\begin{frame}

\begin{figure}
\centering
\subcaptionbox{look at dis face}{\includegraphics[height=3cm]{example-image-duck}}

\subcaptionbox{feed me}{\includegraphics[height=3cm]{example-image-duck}}
\end{figure}

\end{frame}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Lyx cross refernce to figures not working when there is a new line between caption and label

Beamer subfig captions without prefixes

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