I tried the following

----
\begin{longtable}{| l || r | r | r | c |}  
\myhline
Name&Exam1&Exam2&Exam3&Grade\\
\myhline
Jack&12& 28&33&C \\  
\hline
Paul&49& 35&60&B  \\
\hline
Michael&76& 38&59&A  \\
\myhline
\end{longtable}
----

with the following definition of \myhline :

\newdimen\arrayruleHwidth
 \setlength{\arrayruleHwidth}{1.5pt}
  \makeatletter
\def\myhline{%
  \noalign{\LT@sep}%
  \multispan\LT@cols
     \unskip\leaders\hrule\@height\arrayruleHwidth\hfill\cr
  \noalign{\penalty\@M}%
  \@gtempa}
\makeatother

(from  the longtable.sty  after  modification):



Now \myhline seems to work in longtable except the first \myhline
(before the first head).

When I use \myhline before the first head  I get the following message :
----
Overfull \hbox (0.93033pt too wide) in paragraph at lines 325--325
[]|\T1/cmr/m/n/12 Time
[7]
! Undefined control sequence.
\myhline ->\noalign {\LT@sep 
                           }\multispan \LT@cols \unskip \leaders \hrule \@he...
l.373 \myhline
            
? 
---

When I use \hline\myhline before the first head it works:
----
\begin{longtable}{| l || r | r | r | c |}  
\hline
\myhline

Name&Exam1&Exam2&Exam3&Grade\\

\myhline

Jack&12& 28&33&C \\ 
....

-----

But how to modify the definition of \myhline to get
it working before the first head of longtable?


TIA

Jan

mch2048@yahoo.com (jan)  schrieb:

> 
> But how to modify the definition of \myhline to get
> it working before the first head of longtable?

You can use booktabs, and read the documentation about using to much 
vertical lines.

\documentclass{article}
\usepackage{longtable,booktabs}


\begin{document}
\begin{longtable}{| l || r | r | r | c |}
\toprule
Name&Exam1&Exam2&Exam3&Grade\\
\midrule
Jack&12& 28&33&C \\
\hline
Paul&49& 35&60&B  \\
\hline
Michael&76& 38&59&A  \\
\bottomrule
\end{longtable}

or use a command along the lines of 
\newcommand{\myhline}{\noalign{\global\arrayrulewidth1cm}\hline
    	    	    	    \noalign{\global\arrayrulewidth1pt}}

or

\setlength{\doublerulesep}{0pt}
\newcommand{\myhline}{\hline\hline\hline}

-- 
Ulrike Fischer
e-mail: zus�tzlich meinen Vornamen vor dem @ einf�gen.
e-mail: add my first name between the news and the @.