Dear all, I am unable to understand how Hline() works in tabular(). I've read the vignette and the help page, and here this example compiles perfectly fine: latex( tabular( Species + Hline() + 1 ~ Heading()*mean*All(iris), data=iris) ) However, if I try it on my own data it fails. Consider this: set.seed(1) Xa <- data.frame(p=rep(c("First group","Second group","Third group"),each=10,len=30), a=sample(c("Some long label","Some other long label", "Yet another label"), 30, replace=TRUE),id=seq(30), b=round(runif(30,10,20)), c=round(runif(30,40,70))) (x <- tabular(((p=factor(p))*(a=factor(a))+1) ~ (N = 1) + (b + c)* (mean+sd),data=Xa)) p a N mean sd mean sd First group Some long label 3 15.67 2.082 64.33 3.786 Some other long label 4 14.75 2.630 52.25 8.461 Yet another label 3 15.67 3.215 50.67 3.055 Second group Some long label 2 17.00 1.414 57.50 10.607 Some other long label 3 17.00 1.000 60.00 8.888 Yet another label 5 15.00 3.082 58.20 8.672 Third group Some long label 4 13.75 3.594 58.75 5.909 Some other long label 4 13.50 1.732 46.50 3.786 Yet another label 2 16.00 1.414 50.00 4.243 All 30 15.13 2.501 55.37 8.045 I would like to place an Hline() between rows 3:4, rows 6:7, rows 9:10. But either way I place it I get something that doesn't compile in LaTeX ("! Misplaced \noalign." error). For example, x <- tabular(((p=factor(p)))*(a=factor(a)) +(Hline() + 1) ~ (N = 1) + (b + c)* (mean+sd),data=Xa) latex(x) \begin{tabular}{llccccc} \hline & & & \multicolumn{2}{c}{b} & \multicolumn{2}{c}{c} \\ p & a & N & mean & sd & mean & \multicolumn{1}{c}{sd} \\ \hline First group & Some long label & $\phantom{0}3$ & $15.67$ & $2.082$ & $64.33$ & $\phantom{0}3.786$ \\ & Some other long label & $\phantom{0}4$ & $14.75$ & $2.630$ & $52.25$ & $\phantom{0}8.461$ \\ & Yet another label & $\phantom{0}3$ & $15.67$ & $3.215$ & $50.67$ & $\phantom{0}3.055$ \\ Second group & Some long label & $\phantom{0}2$ & $17.00$ & $1.414$ & $57.50$ & $10.607$ \\ & Some other long label & $\phantom{0}3$ & $17.00$ & $1.000$ & $60.00$ & $\phantom{0}8.888$ \\ & Yet another label & $\phantom{0}5$ & $15.00$ & $3.082$ & $58.20$ & $\phantom{0}8.672$ \\ Third group & Some long label & $\phantom{0}4$ & $13.75$ & $3.594$ & $58.75$ & $\phantom{0}5.909$ \\ & Some other long label & $\phantom{0}4$ & $13.50$ & $1.732$ & $46.50$ & $\phantom{0}3.786$ \\ & Yet another label & $\phantom{0}2$ & $16.00$ & $1.414$ & $50.00$ & $\phantom{0}4.243$ \\ & \hline % & & & & & \\ & All & $30$ & $15.13$ & $2.501$ & $55.37$ & $\phantom{0}8.045$ \\ \hline \end{tabular} Please advise how to use Hline() in the example above. Regards, Liviu -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail