In my .Snw file: <<>>fyle <- choose.files() fyle f <- count.fields(fyle, sep = "\t") f @ and in the .tex file: \begin{Schunk} \begin{Sinput} > fyle <- choose.files() > fyle \end{Sinput} \begin{Soutput} [1] "C:\\Files\\Data\\Cars03\\Rover.txt" \end{Soutput} \begin{Sinput} > f <- count.fields(fyle, sep = " ") > f \end{Sinput} \begin{Soutput} [1] 8 8 8 8 8 \end{Soutput} \end{Schunk} But I want the sep = "\t" to be left as is. Murray -- Dr Murray Jorgensen stats.waikato.ac.nz/Staff/maj.html Department of Statistics, University of Waikato, Hamilton, New Zealand Email: maj at waikato.ac.nz Fax 7 838 4155 Phone +64 7 838 4773 wk +64 7 849 6486 home Mobile 021 1395 862