\documentclass[titlepage]{article}
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\usepackage[colorlinks,linkcolor=blue,citecolor=blue,urlcolor=blue,breaklinks=true]{hyperref}
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\usepackage{longtable}
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\usepackage{Sweave}
\SweaveOpts{keep.source=true}
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%\VignetteIndexEntry{Formatting Tables with latexpdf}
\begin{document}
\SweaveOpts{concordance=TRUE}
\vspace*{2cm}
\begin{center}
\vspace{1.5cm}
{\Large Formatting Tables with latexpdf}\\
~\\
\today\\
~\\
Tim Bergsma\\
\end{center}
\newpage

\section*{Introduction}

The R package 'latexpdf' supports rich aesthetics for embedding tables in PDF documents, illustrated below.  Be sure to set chunk option 'results' to 'tex'.  Although illustrations us as.ltable(), many arguments are passed through to as.tabular().  See also as.pdf() for creating stand-alone table images.

\section*{Examples}
We make a sample data frame.
<<sample>>=
x <- data.frame(
  study=c(rep('PROT01',5),NA),
  subject=rep(c(1001,1002),each=3),
  time=c(0,1,2,0,1,2),
  conc=c(0.12,34,5.6,.5,200,NA)
)
x
@
Now we try various invocations.
<<results=tex>>=
library(latexpdf)
writeLines(as.ltable(x))
@
<<results=tex>>=
writeLines(as.ltable(x,environments=NULL))
@
<<results=tex>>=
writeLines(as.ltable(x,caption='Plasma Concentrations',label='pctab'))
@
<<results=tex>>=
writeLines(as.ltable(x,caption='Plasma Concentrations',cap.top=FALSE))
@
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='grid is TRUE'))
@
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Includes Walls',walls=1,rules=c(1,2,1)))
@
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Custom Breaks',
    colbreaks=c(0,2,0),rowgroups=x$subject
))
@
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Custom Justify',
    numjust='left',charjust='right'
))
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Decimal Align',
    justify=c('center','left','right','decimal')
))
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Not Verbatim',
    justify=c('center','left','right','decimal'),
    verbatim=FALSE
))
<<results=tex>>=
writeLines(as.ltable(x,grid=TRUE,caption='Custom Column Width',
    justify=c('center','left','right','decimal'),
    colwidth=c(NA,NA,NA,'2cm')
))
<<results=tex>>=
writeLines(as.ltable(x,caption='Row Colors',rowcolors=c('white','lightgray')))
@
<<results=tex>>=
writeLines(
  as.ltable(
    x,
    caption='Row Groups',
    rowgroups=as.character(x$subject),
    rowgrouplabel='groups',
    rowgrouprule = 2
  )
)
@
<<results=tex>>=
writeLines(
  as.ltable(
    x,
    caption='Column Groups',
    colgroups=c('demographic','demographic','clinical','clinical')
  )
)
@
<<results=tex>>=
writeLines(
  as.ltable(
    x,
    caption='Row and Column Groups',
    rowgroups=as.character(x$subject),
    colgroups=c('demographic','demographic','clinical','clinical'),
    rowgrouprule = 1,
    grid=TRUE
  )
)
@
\end{document}