knit("code.Rnw","code.tex")

documentclass[12pt,english,nohyper]{tufte-handout}
usepackage{longtable}

begin{document}

<<echo=FALSE,results='asis'>>=
library(xtable)
@

begin{tabular}{cc}
  hline
 & vals \
  hline
a & 3.39 \
  b & 4.35 \
  c & 6.16 \
  d & 9.17 \
  e & 2.82 \
   hline
end{tabular}
quad % separates first and second table
begin{tabular}{cc}
  hline
 & vals \
  hline
a & 3.39 \
  b & 4.35 \
  c & 6.16 \
  d & 9.17 \
  e & 2.82 \
   hline
end{tabular}

end{document}

documentclass[12pt,english,nohyper]{tufte-handout}
usepackage{longtable}

begin{document}

<<echo=FALSE,results='asis'>>=
library(xtable)
@

begin{longtable}{cc} % CHANGED FROM "TABULAR" TO "LONGTABLE"
  hline
 & vals \
  hline
a & 3.39 \
  b & 4.35 \
  c & 6.16 \
  d & 9.17 \
  e & 2.82 \
   hline
end{longtable} % CHANGED FROM "TABULAR" TO "LONGTABLE"
quad % separates first and second table
begin{longtable}{cc} % CHANGED FROM "TABULAR" TO "LONGTABLE"
  hline
 & vals \
  hline
a & 3.39 \
  b & 4.35 \
  c & 6.16 \
  d & 9.17 \
  e & 2.82 \
   hline
end{longtable} % CHANGED FROM "TABULAR" TO "LONGTABLE"

end{document}