[Tex/LaTex] How to make multiple references to the same footnote

footnotesmemoir

I am using the memoir class.

In some parts of the page, there are multiple spots that need to be annotated with the same footnote.

Lorem ipsum dolor[1] sit amet, consectetur adipiscing elit[2], sed do eiusmod tempor incididunt ut labore et dolore[1] magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor[1] in reprehenderit in voluptate velit esse cillum dolore[1] eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

1: See Appendix on dolors.

2: See Appendix on elites.

Currently, I am manually specifying the footnotes, such as ipsum dolor\footnote[1]{See \emph{Appendix on dolors}.} sit amet. Then I have to manually add the other footnote marks: labore et dolore\textsuperscript{1} magna aliqua

But I don't want to manually keep track of what number is what footnote. They get moved around a lot and I keep forgetting. Besides, I shouldn't have to manually keep track of the numbering, Latex should do it for me.

What command can I use to reference the same footnote multiple times, so that the footnotes are automatically numbered?

Best Answer

Using Andrews MWE and adding some Heiko magic:

\documentclass{memoir}
\usepackage[height=30mm]{geometry}%
\usepackage{refcount}
\begin{document}
  One footnote\footnote{A wonderful footnote!\label{foot}}
  and a second one\footnote{A less wonderful footnote!\label{toe}}.

  The last footnote, \ref{foot}, is really nice. I like
  footnote~\ref{foot} more than footnote \ref{toe}. Here is another
  footnote with the first footnote marker\footnotemark[\getrefnumber{foot}]
  and a second footnote with the second foot note
  marker\footnotemark[\getrefnumber{toe}].

\end{document}

The point is that \ref{...} gives number + \hbox{}, thus \footnotemark does not like it as it expects a number.

The solution probably fails if something other than numbers are used to mark footnotes.

Note how the \label have been added inside the footnotes.

Related Solutions

[Tex/LaTex] Beamer: multiple references to the same footnote

The Hfootnote counter is needed for articles because hyperref plays fast and loose with the internals and has its own counters for many things, including footnotes. So when changing a counter in a non-normal fashion, you also have to change the hyperref version, which is usually H<original counter name>.

However, this is only needed when hyperref is making links between things in the document. In this case, it isn't. Beamer turns off much of hyperref's stuff as it loads the package with implicit=false. If you look carefully at the resulting PDF of a beamer presentation with footnotes, you'll see that there are no hyperlinks on footnotes.

So the internal footnote stuff isn't installed, and this is why Marco gets the error that he does: Hfootnote isn't defined.

Thus, in fact, the original solution from the LaTeX WikiBook works absolutely fine in this context:

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{block}{testblock}
    one program\footnote{open-source software},
    other program\footnotemark[\value{footnote}],
    third program\footnote{proprietry}
\end{block}
\end{frame}
\end{document}

Indeed, this is a far more robust version since if you want more references to the same footnote, you can easily just copy that line:

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{block}{testblock}
    one program\footnote{open-source software},
    other program\footnotemark[\value{footnote}],
    other program\footnotemark[\value{footnote}],
    third program\footnote{proprietry}
\end{block}
\end{frame}
\end{document}

This would not work with the \addtocounter hack, you'd need to \addtocounter{footnote}{-1} after each use of the footnotemark. However, this still doesn't work with out-of-order footnotes, to do that you'd need to save the footnote marker. Here's a simple hack for that, though I wouldn't be surprised to learn that there's a package to do it more cleanly (and that can cope with saving more than one footnote at a time).

\documentclass{beamer}
\renewcommand{\thefootnote}{\alph{footnote}}
\newcommand{\savefootnote}{\edef\tmpfn{\the\value{footnote}}}
\newcommand{\savedfootnote}{\footnotemark[\tmpfn]}
\begin{document}

\begin{frame}
\begin{block}{testblock}
    one program\footnote{open-source software}\savefootnote,
    other program\savedfootnote,
    fourth program\savedfootnote,
    third program\footnote{proprietry}
    other program\savedfootnote
\end{block}
\end{frame}
\end{document}

(Note: As this answer has been accepted, and as nothing in the above is actually wrong, I'm adding this rather than deleting the above and replacing it. However, the below is a more accurate analysis and more suitable fix. I still don't claim any elegance, though.)

After a bit of digging, I've discovered that this is nothing to do with beamer whatsoever and everything to do with minipages. The reason that you are seeing this is because when beamer does fancy boxes then the contents get put inside a minipage. Minipages have their own setup for footnotes and so within a minipage we have to hook in to the minipage system instead of the usual one. In particular, minipage footnotes have their own counter, mpfootnote, and this is the one that should be saved. At the start of the minipage environment, the old footnote stuff is replaced by the minipage-specific stuff. This should mean that everything just works. Except that it doesn't, because whoever designed the minipage environment didn't think that someone would want to use the \footnotemark command with an optional argument so the particular bit that that calls isn't swapped.

Fortunately, it's not hard to swap that bit if we need it. Unfortunately, I can't see a way to test if we're in a minipage so we need to define a different command to save the footnote inside a minipage (or a block) to outside. Maybe some passerby will be able to correct this.

Here's a sample code:

\documentclass{article}

\makeatletter
\newcommand{\savefootnote}{%
\edef\tmpfn{\the\value{footnote}}}
\newcommand{\savempfootnote}{%
    \let\@xfootnotemark=\@mpxfootnotemark
\edef\tmpfn{\the\value{footnote}}}
\newcommand{\savedfootnote}{\footnotemark[\tmpfn]}
\def\@mpxfootnotemark[#1]{%
  \begingroup
  \c@footnote #1\relax
  \unrestored@protected@xdef\@thefnmark{\thempfootnote}%
  \endgroup
  \@footnotemark}
\makeatother
\begin{document}

    one program\footnote{open-source software}\savefootnote,
    one program\savedfootnote,
    one program\savedfootnote,
    other program\footnote{proprietry},
    one program\savedfootnote,
\begin{minipage}{\textwidth}
    one program\footnote{open-source software}\savempfootnote,
    one program\savedfootnote,
    one program\savedfootnote,
    other program\footnote{proprietry},
    one program\savedfootnote,
\end{minipage}
\end{document}

[Tex/LaTex] Multiple references to the same footnote inside a table environment

You could use my answer to the same question and use \footref provided by scrextend (part of the KOMA-Script bundle). This is at least working partially. For reasons I haven't figured out yet the hyperlink from \footref inside the table links to the table caption, though, instead of the footnote. I don't know if that is a failure of scrextend or hyperref…

\documentclass{article}
% call `scrextend' before `hyperref'!
\usepackage{scrextend}
\usepackage{hyperref}

\begin{document}

This is a paragraph\footnote{\label{first}some footnote}.

This is another paragraph\footnote{\label{second}another footnote}.

This is another paragraph using the first footnote\footref{first}.


\begin{table}
\caption{A table}
\begin{minipage}{\textwidth}
\begin{tabular}{rrr}
 \hline
  E\footnote{\label{1sttablefoot}Some table footnote} &
  F\footref{1sttablefoot} &
  G \footnote{Another table footnote} \\
 \hline 
  1 & 2 & 3 \\
 \hline
\end{tabular}
\end{minipage}
\end{table}

\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] Beamer: multiple references to the same footnote

[Tex/LaTex] Multiple references to the same footnote inside a table environment

Related Question