DEar list members,

I am currently using Sweave with LaTeX which is great.

I can use xtable for formatting outp of tables but I have a problem setting the number of decimals in xtables when used with dataframe.

I have found an example on the net ith matrix and it works.

For example this works :
> > tmp <- matrix(rnorm(9), 3, 3) 
> > xtmp <- xtable(tmp)
> > digits(xtmp) <- c(0,0,3,4)
> > print(xtmp, include.rownames = FALSE) # row names

produced :
> % latex table generated in R 2.12.0 by xtable 1.5-6 package
> % Mon Nov 22 17:35:00 2010
> \begin{table}[ht]
> \begin{center}
> \begin{tabular}{rrr}
>   \hline
> 1 & 2 & 3 \\ 
>   \hline
> -2 & -2.158 & 2.8886 \\ 
>   1 & 1.330 & 0.4677 \\ 
>   -0 & 0.486 & -0.3319 \\ 
>    \hline
> \end{tabular}
> \end{center}
> \end{table}



But this won't work :
> > mydata
>   	TEST                t ddl                   p CONDITION
> 2   R1 3.01109061083632  16 0.00828552765650315        C1
> 3   R2 3.30476953908811  16 0.00447412002109504        C1
> 4   DR 2.86343993410509  16  0.0112631908739966        C1
> 5   R1 1.05386387510206  16    0.30760068470456        C2
> 6   R2 3.04997140665209  16 0.00763921045771104        C2
> 7   DR 2.25175987512241  16  0.0387401575011488        C2

but 
> > xtable(mydata,digits=2)

produced

> % latex table generated in R 2.12.0 by xtable 1.5-6 package
> % Mon Nov 22 18:13:47 2010
> \begin{table}[ht]
> \begin{center}
> \begin{tabular}{rlllll}
>   \hline
>  & TEST & t & ddl & p & CONDITION \\ 
>   \hline
> 2 & R1 & 3.01109061083632 & 16 & 0.00828552765650315 & C1 \\ 
>   3 & R2 & 3.30476953908811 & 16 & 0.00447412002109504 & C1 \\ 
>   4 & DR & 2.86343993410509 & 16 & 0.0112631908739966 & C1 \\ 
>   5 & R1 & 1.05386387510206 & 16 & 0.30760068470456 & C2 \\ 
>   6 & R2 & 3.04997140665209 & 16 & 0.00763921045771104 & C2 \\ 
>   7 & DR & 2.25175987512241 & 16 & 0.0387401575011488 & C2 \\ 
>    \hline
> \end{tabular}
> \end{center}
> \end{table}




I have also tried setting the digits with c(0,0,4,0,4,0), using also the 'display' argument to specify the type of each column... noway...


What am I missing ?


Thanks in advance

Sylvain Clément


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