Column names on each page with xtable in Sweave

Question

I want to have column names on each page of the xtable.

\\documentclass{article}
\\usepackage{graphicx}   
\\usepackage{longtable}

\\begin{document}

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Answer 1

I think this is really a LaTeX question, which I simply Googled and ended up with a simple answer from tex.stackexchange.com here.

Try this (untested in LaTeX; will be curious if this compiles the way you want):

print(x.big,tabular.environment='longtable',
        floating=FALSE,
        hline.after = c(-1,nrow(x.big)),
        add.to.row = list(pos = list(0),command = "\\hline \\endhead "))