4

Even by setting hline.after = NULL, a longtable generated by the R package xtable still mantains an hline at the very end of the table.

\documentclass{article}

\usepackage{longtable}

\begin{document}

<<results='asis'>>=
require(xtable)
print(xtable(cars[1:20,], caption = 'NO HLINES'), 
      tabular.environment = "longtable", include.rownames = F, 
      caption.placement = "top", include.colnames = FALSE, 
      hline.after = NULL, floating = FALSE)
@

\end{document}

results in

\begin{longtable}{rr}
\caption{NO HLINES} \\ 
  4.00 & 2.00 \\ 
  4.00 & 10.00 \\ 
  7.00 & 4.00 \\ 
  7.00 & 22.00 \\ 
  8.00 & 16.00 \\ 
  9.00 & 10.00 \\ 
  10.00 & 18.00 \\ 
  10.00 & 26.00 \\ 
  10.00 & 34.00 \\ 
  11.00 & 17.00 \\ 
  11.00 & 28.00 \\ 
  12.00 & 14.00 \\ 
  12.00 & 20.00 \\ 
  12.00 & 24.00 \\ 
  12.00 & 28.00 \\ 
  13.00 & 26.00 \\ 
  13.00 & 34.00 \\ 
  13.00 & 34.00 \\ 
  13.00 & 46.00 \\ 
  14.00 & 26.00 \\ 
  \hline
\end{longtable}
3

You should add the argument booktabs=TRUE in the print.xtable call

print(xtable(cars[1:20,], caption = 'NO HLINES'), 
  tabular.environment = "longtable", include.rownames = F, 
  caption.placement = "top", include.colnames = FALSE, 
  booktabs = TRUE,
  hline.after = NULL, floating = FALSE)

results:

\begin{longtable}{rr}
\caption{NO HLINES} \\ 
4.00 & 2.00 \\ 
4.00 & 10.00 \\ 
7.00 & 4.00 \\ 
7.00 & 22.00 \\ 
8.00 & 16.00 \\ 
9.00 & 10.00 \\ 
10.00 & 18.00 \\ 
10.00 & 26.00 \\ 
10.00 & 34.00 \\ 
11.00 & 17.00 \\ 
11.00 & 28.00 \\ 
12.00 & 14.00 \\ 
12.00 & 20.00 \\ 
12.00 & 24.00 \\ 
12.00 & 28.00 \\ 
13.00 & 26.00 \\ 
13.00 & 34.00 \\ 
13.00 & 34.00 \\ 
13.00 & 46.00 \\ 
14.00 & 26.00 \\ 
\end{longtable}

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