Latex for-loop for table header generation

Question

In the table given here there is repetition of the columns. Is there a way to loop over them in Latex, so that you don't have to manually write out the columns? That way the table would just load the first 5 columns without the user typing such things as \myhead{\csvcoliv}.

\documentclass{article}
\usepackage{csvsimple,array,filecontents,booktabs}

\begin{filecontents*}{forum_posts_table_1.csv}
    posts per author,sentences per post,quoted sentences per post,EREs per post,mentions per ERE
    3.1,23.83454,2313.27,13453453.8,2464642.43
    4.1,23.83454,2313.27,13453453.8,2464642.43
    5.1,23.83454,2313.27,13453453.8,2464642.43
\end{filecontents*}

\begin{document}

\newcommand\myhead[1]{\parbox[t]{5em}{\centering\bfseries#1\par\kern1mm}}

\csvreader[no head,column count=5,tabular=rrrrr,
  table head=\toprule,
  late after first line=\\\midrule,
  table foot=\bottomrule
  ]%
{forum_posts_table_1.csv}{}{%
  \csviffirstrow{\myhead{\csvcoli} & \myhead{\csvcolii} & \myhead{\csvcoliii}
    & \myhead{\csvcoliv} & \myhead{\csvcolv}
    }{\csvlinetotablerow}
}

\end{document}

Answer 1

After fiddling for a while, I came up with a solution (not using a \loop-\repeat-solution):

\documentclass{article}
\usepackage{csvsimple,array,filecontents,booktabs}
\usepackage{forloop}

\newcount\loopcount
\loopcount=5
\newcounter{loopiti}

\def\continuefortheglory{%
    &\fortheglory%
}

\def\fortheglory{%
    \stepcounter{loopiti}%
    \myhead{%
        \expandafter\csname csvcol\roman{loopiti}\endcsname%
    }%
    \ifnum\loopcount>\value{loopiti}%
    \expandafter\continuefortheglory%
    \fi%
}


\begin{filecontents*}{forum_posts_table_1.csv}
    posts per author,sentences per post,quoted sentences per post,EREs per post,mentions per ERE
    3.1,23.83454,2313.27,13453453.8,2464642.43
    4.1,23.83454,2313.27,13453453.8,2464642.43
    5.1,23.83454,2313.27,13453453.8,2464642.43
\end{filecontents*}

\begin{document}

\newcommand\myhead[1]{\parbox[t]{5em}{\centering\bfseries#1\par\kern1mm}}

\csvreader[no head,column count=5,tabular=rrrrr,
  table head=\toprule,
  late after first line=\\\midrule,
  table foot=\bottomrule
  ]%
{forum_posts_table_1.csv}{}{%
  \csviffirstrow{\myhead{\csvcoli} & \myhead{\csvcolii} & \myhead{\csvcoliii}
    & \myhead{\csvcoliv} & \myhead{\csvcolv}
    }{\csvlinetotablerow}
}

\vskip5mm
using fortheglory:
\vskip5mm

\setcounter{loopiti}{0}
\csvreader[no head,column count=5,tabular=rrrrr,
  table head=\toprule,
  late after first line=\\\midrule,
  table foot=\bottomrule
  ]%
{forum_posts_table_1.csv}{}{%
    \csviffirstrow{\fortheglory}{\csvlinetotablerow}
}


\end{document}

EDIT: With this you have to use \loopcount= for every table, that doesn't have the same number of columns as the previous one and have to issue \setcounter{loopiti}{0} before every table, but you could include this in a wrapper command like this:

\newcommand{\glorycol}[1]{\loopcount=#1\setcounter{loopiti}{0}\fortheglory}

Then you just have to use it for a table with, e.g. 5 columns, like this:

\csvreader[no head,column count=5,tabular=rrrrr,
  table head=\toprule,
  late after first line=\\\midrule,
  table foot=\bottomrule
  ]%
{forum_posts_table_1.csv}{}{%
    \csviffirstrow{\glorycol{5}}{\csvlinetotablerow}
}

There might be a better way (for example automaticly determining the number of columns and giving an optional argument just if that fails) but that's out of my skill (at the moment, I hope...).