# How do I refer to a footnote with supertabular?

I use the mpsupertabular environment of supertabular in order to permit footnote. The basic \footnote command works fine, although it uses letters rather than numbers for the footnote marks. However, when I attempt to refer to a previous footnot the footnote mark render as a number, rather than the letter of the original footnote. I tried using \footnotemark[\alph{fn:sub}], but that gives me the error message

! Missing number, treated as zero.

\documentclass{article}
\usepackage{supertabular}

\begin{document}

\section {Symbols}
\label{sec:Symbols}
These macros simply generated predefined symbols in an appropriate font. Change them as appropriate for your house
style.

\bottomcaption{Symbols}
{
\hline
Macro & Definition & Meaning \\
\hline
%  & & \\
%  \hline
}

{
\hline
\multicolumn{3}{|c|}{\small\sl continued from previous page} \\
\hline
Macro & Definition & Meaning \\
\hline
%  & & \\
%  \hline
}

\tabletail%
{
\hline
\multicolumn{3}{|c|}{\small\sl continued on next page} \\
\hline
}

\tablelasttail%
{
\hline
}

\begin{mpsupertabular}[t]{| l | l | p{3.2in} |}
A & B &  C
\footnote{footnote.}
\newcounter{fn:sub}
\setcounter{fn:sub} {\value{mpfootnote}}
\\
\hline
D & E & F
({\textbackslash}alph\{fn:sub\} = \alph{fn:sub})
\footnotemark[\value{fn:sub}]
\\
%    \hline
%    D & E & F
%    ({\textbackslash}alph\{fn:sub\} = \alph{fn:sub})
%    \footnotemark[\alph{fn:sub}]
%    Gets ("C:\Program Files\MiKTeX 2.9\tex\latex\base\omscmr.fd")
%    ! Missing number, treated as zero.
%    \\
\end{mpsupertabular}

\end{document}


Environment mpsupertabular puts a table page into a minipage, therefore the footnote markers of \footnote come from the \footnote inside a minipage with markers as small letters by default.

\footnotemark is not intended for the footnotes of the minipage, but for the footnotes of the page. Therefore, it is numbered as the page footnotes. \footnotetext would then go outside the minipage.

The following example defines \mpfootnotemark in a similar way as \footnotemark, but applied to the minipage footnotes. Then, \mpfootnotemark[\value{fn:sub}] uses the markers formatted for minipage footnotes.

\documentclass{article}
\usepackage{supertabular}

\makeatletter
\newcommand*{\mpfootnotemark}{%
\@ifnextchar[\@xmpfootnotemark{%
\stepcounter{mpfootnote}%
\protected@xdef\@thefnmark{\thempfootnote}%
\@footnotemark
}%
}
\def\@xmpfootnotemark[#1]{%
\begingroup
\c@mpfootnote #1\relax
\unrestored@protected@xdef\@thefnmark{\thempfootnote}%
\endgroup
\@footnotemark
}
\makeatother

\begin{document}

\section {Symbols}
\label{sec:Symbols}
These macros simply generated predefined symbols in an appropriate font. Change
style.

\bottomcaption{Symbols}
{
\hline
Macro & Definition & Meaning \\
\hline
%  & & \\
%  \hline
}

{
\hline
\multicolumn{3}{|c|}{\small\sl continued from previous page} \\
\hline
Macro & Definition & Meaning \\
\hline
%  & & \\
%  \hline
}

\tabletail%
{
\hline
\multicolumn{3}{|c|}{\small\sl continued on next page} \\
\hline
}

\tablelasttail%
{
\hline
}

\begin{mpsupertabular}[t]{| l | l | p{3.2in} |}
A & B &  C
\footnote{footnote.}
\newcounter{fn:sub}
\setcounter{fn:sub} {\value{mpfootnote}}
\\
\hline
D & E & F
({\textbackslash}alph\{fn:sub\} = \alph{fn:sub})
\mpfootnotemark[\value{fn:sub}]
\\
\end{mpsupertabular}

\end{document}


• +1 -- and my heartiest congratulations on achieving the 200k rep mark!!! – Mico Sep 13 '17 at 21:44
• @Mico Thanks, your vote hit the mark exactly! – Heiko Oberdiek Sep 13 '17 at 21:48