# Table caption not appearing in PNAS document class

I am unable to get table captions to show up when using the PNAStwo document class from 2008 (the latest version includes printer marks that I do not want).

The documentation says "Figure and table captions should be entered at the end of the document..." but as captions are shown for figures, I'd like them to be shown for tables too.

I was hoping their recommendation wasn't implemented as a limit for authors but it seems it is, or am I missing something? If not, is there a workaround I can employ?

\documentclass{pnastwo}

\usepackage{graphicx}
\usepackage{pnastwoF}
\usepackage{amssymb,amsfonts,amsmath}

\begin{document}

\begin{article}

\begin{table}[h]
\begin{tabular}{cc}
1 & 2 \\
3 & 4
\end{tabular}
\caption{A caption that does not appear.}
\end{table}

\begin{figure}
\caption{A caption that does appear.}
\end{figure}

\end{article}

\end{document}
• Could you add a link to where the class file can be downloaded, it is not on CTAN. – Torbjørn T. Mar 16 '14 at 18:33
• @TorbjørnT. Apologies for that, the link to the particular version I'm using is as follows: PNAS – Doggie52 Mar 16 '14 at 19:28
• What happens if you put the \caption before the tabular, instead of afterwards? (cf the example file in your link) – alexwlchan Mar 16 '14 at 21:24
• @alexwlchan It does not change the behavior unfortunately. – Doggie52 Mar 19 '14 at 15:53

I just ran into the same issue. (It's really annoying when trying to produce print-quality preprint versions of the paper.) Poking around in pnastwo.cls, I found the following fix:

Find the first line in pnastwo.cls which says

\ifx\@captype\xtable


Change this to

\ifx\@captype\table


Alternatively, if you don't want to touch the class file, you can put the following into the preamble of your document:

% Fix wierd behavior which prevents table captions from appearing for
% tables in the body of the article
\makeatletter
\long\def\@makecaption#1#2{%
\ifx\@captype\table
\let\currtabcaption\relax
\gdef\currtabcaption{
\tabnumfont\relax #1. \tabtextfont\relax#2\par
\vskip\belowcaptionskip
}
\else
\vskip\abovecaptionskip
\sbox\@tempboxa{\fignumfont#1.\figtextfont\hskip.5em\relax #2}%
\ifdim \wd\@tempboxa >\hsize
\fignumfont\relax #1.\figtextfont\hskip.5em\relax#2\par
\else
\global \@minipagefalse
\hb@xt@\hsize{\hfil\box\@tempboxa\hfil}%
\fi
\fi
}
\makeatother


One additional comment: once this bug is fixed, you'll almost certainly run into another issue which you'd want fixed if you use the PNAS two-column class to produce production-quality output: Unless you define floats with the h "here" placement, it loses the labels, so all cross-referencing of figures and tables breaks. Here is the fix, for direct pasting into the document preamble. You can also patch up the macro \DonormalEndcol pnastwo.cls, it's the same mistake 6 times over...

% And another fix.  PNAS class loses the label of floats unless they
% were defined with the [h] option (so not really floats at all).  It
% all comes down to wrong scope in the following routine which pushes
% out the floats onto the page.  This is the fixed version:
\makeatletter
\def\DonormalEndcol{%
%% top float ==>
\ifx\toporbotfloat\xtopfloat%
%% figure ==>
\ifcaptypefig%
\expandafter\gdef\csname topfloat\the\figandtabnumber\endcsname{%
\vbox{\vskip\PushOneColTopFig%
\unvbox\csname figandtabbox\the\loopnum\endcsname%
\vskip\abovefigcaptionskip%
\csname caption\the\loopnum\endcsname%
\csname letteredcaption\the\loopnum\endcsname%
\csname continuedcaption\the\loopnum\endcsname%
\csname letteredcontcaption\the\loopnum\endcsname
\ifredefining%
\csname label\the\loopnum\endcsname%
\expandafter\gdef\csname topfloat\the\loopnum\endcsname{}\fi}%
\vskip\intextfloatskip%%
\vskip-4pt %% probably an artifact of topskip??
}%
\else%
%% plate ==>
\ifcaptypeplate%
\expandafter\gdef\csname topfloat\the\figandtabnumber\endcsname{%
\vbox{\vskip\PushOneColTopFig%
\unvbox\csname figandtabbox\the\loopnum\endcsname
\vskip\abovefigcaptionskip
\csname caption\the\loopnum\endcsname
\csname letteredcaption\the\loopnum\endcsname
\csname continuedcaption\the\loopnum\endcsname
\csname letteredcontcaption\the\loopnum\endcsname
\ifredefining
\csname label\the\loopnum\endcsname
\expandafter\gdef\csname topfloat\the\loopnum\endcsname{}\fi}
\vskip\intextfloatskip %%
\vskip-4pt %% probably an artifact of topskip??
}%
\else% table ==>
\expandafter\gdef\csname topfloat\the\figandtabnumber\endcsname{%
\vbox{\vskip\PushOneColTopTab %%
\csname caption\the\loopnum\endcsname
\csname letteredcaption\the\loopnum\endcsname
\csname continuedcaption\the\loopnum\endcsname
\csname letteredcontcaption\the\loopnum\endcsname
\vskip\captionskip
\unvbox\csname figandtabbox\the\loopnum\endcsname
\ifredefining
\csname label\the\loopnum\endcsname
\expandafter\gdef\csname topfloat\the\loopnum\endcsname{}\fi
}\vskip\intextfloatskip %% why don't we need this?
\vskip-10pt}
\fi\fi%
%
\else% bottom float
%
\ifcaptypefig
\expandafter\gdef\csname botfloat\the\figandtabnumber\endcsname{%
\vskip\intextfloatskip
\vbox{\unvbox\csname figandtabbox\the\loopnum\endcsname
\vskip\abovefigcaptionskip
\csname caption\the\loopnum\endcsname
\csname letteredcaption\the\loopnum\endcsname%
\csname continuedcaption\the\loopnum\endcsname%
\csname letteredcontcaption\the\loopnum\endcsname%
\vskip\PushOneColBotFig%%
\ifredefining%
\csname label\the\loopnum\endcsname
\expandafter\gdef\csname botfloat\the\loopnum\endcsname{}\fi}}%
\else
\ifcaptypeplate
\expandafter\gdef\csname botfloat\the\figandtabnumber\endcsname{%
\vskip\intextfloatskip
\vbox{\unvbox\csname figandtabbox\the\loopnum\endcsname
\vskip\abovefigcaptionskip
\csname caption\the\loopnum\endcsname
\csname letteredcaption\the\loopnum\endcsname%
\csname continuedcaption\the\loopnum\endcsname%
\csname letteredcontcaption\the\loopnum\endcsname%
\vskip\PushOneColBotFig%%
\ifredefining%
\csname label\the\loopnum\endcsname
\expandafter\gdef\csname botfloat\the\loopnum\endcsname{}\fi}}%
\else% TABLE
\expandafter\gdef\csname botfloat\the\figandtabnumber\endcsname{%
\vskip\intextfloatskip
\vbox{\csname caption\the\loopnum\endcsname
\csname letteredcaption\the\loopnum\endcsname
\csname continuedcaption\the\loopnum\endcsname
\csname letteredcontcaption\the\loopnum\endcsname%
\vskip.5\intextfloatskip
\unvbox\csname figandtabbox\the\loopnum\endcsname%
\vskip\PushOneColBotTab
\ifredefining%
\csname label\the\loopnum\endcsname
\expandafter\gdef\csname botfloat\the\loopnum\endcsname{}\fi}}%
\fi\fi\fi}
\makeatother

• I started using this, however it changes the style of the table caption. – Avi Ginsburg Feb 10 '16 at 12:06

The template file that's distributed along with the class says

%----------------------------------------------------------------------------------------
%       FIGURES AND TABLES
%----------------------------------------------------------------------------------------

%% Adding Figure and Table References
%% Be sure to add figures and tables after \end{article}
%% and before \end{document}


Here's the example:

\documentclass{pnastwo}

\usepackage{graphicx}
%\usepackage{pnastwoF} % this is not required
\usepackage{amssymb,amsfonts,amsmath}

\usepackage{lipsum} % just for the example

\begin{document}

\title{X}
\author{A. Uthor\affil{1}{University of Nowhere}}

\contributor{Submitted to Proceedings of the National Academy of Sciences
of the United States of America}

%----------------------------------------------------------------------------------------

\maketitle % The \maketitle command is necessary to build the title page

\begin{article}

\lipsum

\end{article}

\begin{table}[h]
\caption{A caption that appears.}
\begin{tabular}{cc}
1 & 2 \\
3 & 4
\end{tabular}
\end{table}

\begin{figure}[h]
\caption{A caption that does appear.}
\end{figure}

\end{document}


Note that the table caption is typeset with the same width as the tabular environment. Why? I don't know.

• But I'd prefer to have my tables in the report itself, not at the end of it. I'd prefer to then have my captions shown where that table appears. – Doggie52 Mar 17 '14 at 14:38
• @Doggie52 then use a different class. This class is made to the requirements of a specific journal. If you are not submitting to that journal, use a different class. They made the class, their rules. – daleif Mar 19 '14 at 16:10
• @daleif Fair enough, point taken. I am just so happy with how the rest of the report is laid out with the class. If I can stick to using that class I would very much like to. Besides, it would be interesting to learn how these "rules" regarding captions are set-up from within a class. – Doggie52 Mar 19 '14 at 16:14