R: Print two tables with xtable ()

Question

I have data tables (d1 and d2) which I would like to print side by side or on top of each other in latex with their own individual titles. Is it possible to do that directly wit

Answer 1

See Alan Munn's answer to a similar question on tex.stackexchange.com.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{booktabs}
\usepackage{caption}
\title{Side-by-side xtables}
\author{}
\date{}
\begin{document}
\maketitle
First some R code to create some data.
<<>>=
myData <- matrix(c(19,89,23,23,74,44,16,39,67),ncol=3,byrow=TRUE)
colnames(myData) <- c("A","B","C")
rownames(myData) <- c("1","2","3")
myData2 <- myData * 2
@

Now we place the data in two side-by-side tables:

\begin{table}[htb]
\begin{minipage}{.45\textwidth}
\centering
<<echo=FALSE,results=tex>>=
library("xtable")
print(xtable(myData),
  floating=FALSE,
  hline.after=NULL,
  add.to.row=list(pos=list(-1,0, nrow(myData)),
  command=c('\\toprule\n','\\midrule\n','\\bottomrule\n')))
@
\captionof{table}{The first table}
\end{minipage}
\begin{minipage}{.45\textwidth}
\centering
<<echo=FALSE,results=tex>>=
print(xtable(myData2),
  floating=FALSE,
  hline.after=NULL,
  add.to.row=list(pos=list(-1,0, nrow(myData2)),
  command=c('\\toprule\n','\\midrule\n','\\bottomrule\n')))
@
\captionof{table}{The second table}
\end{minipage}
\end{table}
\end{document}

Answer 2

I would recommend saving the results as two separate tables in different files (see the file= option to print.xtable()), and then input them into your LaTeX document with any command you find appropriate for your layout (tabular, subfloat, minipage, etc.). This is what I do in general, although I generally rely on LaTeX facilities in the Hmisc package. Should you want only to print them as a standalone PDF, use the standalone class for your document.

So, here is an example:

data(tli)
fm1 <- aov(tlimth ~ sex + ethnicty + grade + disadvg, data=tli)
print(xtable(fm1), file="ta.tex", floating=FALSE)
print(xtable(head(tli, n=5)), file="tb.tex", floating=FALSE)

then, a quick tex wrapper (compile with pdflatex):

\documentclass{article}
\usepackage{subfig}
\usepackage{graphicx}

\begin{document}

\begin{table}[ht]
\centering
\subfloat[Table x(a)]{\label{tab:tab1a}\scalebox{.5}{\input{./ta}}}\quad
\subfloat[Table x(b)]{\label{tab:tab1b}\scalebox{.5}{\input{./tb}}}
\caption{Caption about here}
\label{tab:tab1}
\end{table}

\end{document}

Here is the result:

Remove the \scalebox command for default (stacked) layout, unless they are narrow enough to fit at their default size, as noted by @David.