How to programmatically make tabular rows using `\whiledo` ?

Question

The following code snippet does not work:

\documentclass{minimal}
\usepackage{longtable}
\usepackage{ifthen}
\newcounter{xyz}
\setcounter{xyz}{0}

\begin{document}

\begin{longtable}{|*2{c|}}
\hline
\whiledo{\value{xyz}<10}%
{%
\thexyz & something\stepcounter{xyz} \\\hline%
}%
\end{longtable}
\end{document}

score 18 · Accepted Answer · answered Dec 22 '10 at 19:45

\documentclass{article}

\usepackage{longtable}
\newcounter{xyz}\newcounter{uvw}

\makeatletter
\newtoks\@tabtoks
\newcommand\addtabtoks[1]{\@tabtoks\expandafter{\the\@tabtoks#1}}
\newcommand*\resettabtoks{\@tabtoks{}}
\newcommand*\printtabtoks{\the\@tabtoks}
\makeatother

\pagestyle{empty}
\begin{document}

\resettabtoks
\loop\ifnum\theuvw<10\relax
  \stepcounter{uvw}
  \addtabtoks{\thexyz & something\stepcounter{xyz} \\\hline}%
\repeat
\begin{longtable}{|*2{c|}}\hline
\printtabtoks
\end{longtable}

\end{document}

thanks for the solution. This solution is also informative that lets me know the plain tex. — Display Name, Dec 23 '10 at 07:04

yannisl · Answer 2 · 2012-04-02T18:04:17.450

9

Try this:

\documentclass{article}
\usepackage{longtable}
\usepackage{ifthen, xspace}
\newcounter{xyz}
\setcounter{xyz}{0}

\begin{document}
\def\and{&\xspace}
\begin{longtable}{|*2{c|}}
\hline
\whiledo{\value{xyz}<10}%
{%
\thexyz \and something\stepcounter{xyz} \\\hline%
}%
\end{longtable}
\end{document}

Edit Changed from minimal class to article (see comments).

edited Apr 02 '12 at 18:04

answered Dec 22 '10 at 17:46

yannisl

117,160

1

I don't think that's the right way to do things. I'm not sure exactly what's going on here, but the rules don't appear so something fishy is going on. – TH. Dec 22 '10 at 19:27
thanks for answering. I got a result without horizontal and vertical tabular rules after compiling your code. – Display Name Dec 23 '10 at 00:03
2

@xport: changing the class to article solves the problem (although I don't know why). – Bruno Le Floch Mar 07 '11 at 20:33
@Bruno It puzzled me ever since! – yannisl Mar 07 '11 at 23:25
@YiannisLazarides: Have you found the reason of this puzzle? – kiss my armpit Jun 07 '12 at 15:54
1

@Forgiver Yes, it was due to the OP having used the minimal class. There was a follow up question by Bruno, will find it out a bit later and post the link. – yannisl Jun 07 '12 at 15:57

How to programmatically make tabular rows using `\whiledo` ?

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