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I am using TL 2023 (Ubuntu 24.04)

It seems that xr-hyper does work for the beamer class (using or not using subfiles)

I have a longer (500 page) beamer document, that I split using subfiles. I deal with the links between sub documents, using xr-hyper. main.tex:

\documentclass[presentation]{beamer} 
\usepackage{xr-hyper}
\usepackage{hyperref}
\hypersetup{%
  colorlinks=true,% hyperlinks will be coloured
%  linkcolor=blue,% hyperlink text will be blue
  urlcolor=blue,% hyperlink text will be blue
%  linkbordercolor=red,% hyperlink border will be red
  urlbordercolor=red,% hyperlink border will be red
}
\externaldocument[M-]{main}[]
\usepackage{subfiles}
\begin{document}
\subfile{part1}
\subfile{part2}
\end{document}

and part1.tex

\documentclass[main.tex]{subfiles}
\usepackage{xr-hyper}
\usepackage{hyperref}
\externaldocument[M-]{main}
\begin{document}
\begin{frame}
  \frametitle{Summary}
  This is a \textbf{xr-hyper} ref: \eqref{M-eq:part2-ceros:1}.

  This is regular reference: \eqref{eq:part2-ceros:1}
  \begin{equation}
    \label{eq:part1-ceros:1}
    \int f dx =0
  \end{equation}
\end{frame}
\end{document}

and part2.tex

\documentclass[main.tex]{subfiles}
\usepackage{xr-hyper}
\usepackage{hyperref}
\externaldocument[M-]{main}
\begin{document}
\begin{frame}
  \frametitle{Main equations}
\textbf{xr-hyper} ref:  \eqref{M-eq:part1-ceros:1}

Usual ref: \eqref{eq:part1-ceros:1}
  \begin{equation}
    \label{eq:part2-ceros:1}
    \sum\limits_{}^{} f dx =0
  \end{equation}
\end{frame}
\end{document}

When I compile main tex the no xr-hyper links work, the xr-hyper don't

I also tried \externaldocument[M-]{main}[] but it does not change

I also tried just two beamer files, without using subfiles but the result was the same, the xr-hyper links do not work.

Any idea?

Thanks

Uwe Brauer

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6
  • 1
    subfiles is a form of \input so you shouldn't use xr at all, as that is for referencing documents that are not input Commented 2 days ago
  • Well, yes and now. While I cannot compile \input files independently, but I can do this with subfiles for example using the article class, I compile the sub-documents independently (from main.tex). So when I compile them I want to check the references links, without being forced to run main.tex. That IMHO is the whole point of subfiles. Commented 2 days ago
  • 1
    well \externaldocument[M-]{main}[] in main.tex is referencing the current document as external so it's conceptually wrong and (as the person who wrote xr) I can confirm that whatever it does is accidental unplanned behaviour. Commented 2 days ago
  • ok, I changed this to \externaldocument[M-]{main} and still does not work, moreover if I consider two beamer files, (not using subfiles) the xr-hyper links do not work in beamer, (I know that beamer rewrites a lot of basic commands) Commented 2 days ago
  • \externaldocument[M-]{main} that is still conceptually wrong, the main document is not external to main Commented 2 days ago

1 Answer 1

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3

In beamer the names of the anchors are not independant from the keys of the labels and the anchor a \ref command is trying to use is not independant of the label key either.

That means that \label{eq:part1-ceros:1} is creating an anchor named eq:part1-ceros:1 while your \ref{M-eq:part1-ceros:1} is looking for M-eq:part1-ceros:1.

In your texlive 2023 there are perhaps additional problems as it didn't correctly record the destination names, see https://github.com/josephwright/beamer/issues/917

In texlive 2025 you could try

\makeatletter
\RenewDocumentCommand{\eqref}{sm}
 {\IfBooleanTF{#1}
   {\textup{\tagform@{\ref*{#2}}}}
   {\textup{\tagform@{\ref{#2}}}}}
\makeatother

and then use \eqref*{M-eq:part2-ceros:1} for xr-hyper references.

Another option is to create two labels everywhere:

\label{eq:part1-ceros:1}\label{M-eq:part1-ceros:1}
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2
  • Thanks, adding \label{eq:part1-ceros:1}\label{M-eq:part1-ceros:1} gives an error, when using amsmath, shall I add your \makeatletter \RenewDocumentCommand{\eqref}{sm} ` {\IfBooleanTF{#1}` {\textup{\tagform@{\ref*{#2}}}} {\textup{\tagform@{\ref{#2}}}}} \makeatother only in the main.tex file or also in the subfiles? Commented 2 days ago
  • I tried out what you suggested in TL2023, it generates references (not colored) and when I try to click on them nothing happens. Commented 2 days ago

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