On Tue, 27 Jul 2010, Murray Jorgensen wrote:
I am introducing the scan() function to my class. Consider the following file
(Scanexamp.Rnw )
\documentclass[12pt]{article}
\begin{document}
<<>> =
height = scan()
64 62 66 65 62
69 72 72 70
part = scan(what = character(0))
"Soprano" "Soprano" "Soprano"
"Alto" "Alto" "Tenor"
"Tenor" "Bass" "Bass"
sh = data.frame(height, part)
sh
@
\end{document}
Now what happens when I attempt to Sweave this is
Sweave("scanexamp.Rnw")
Writing to file scanexamp.tex
Processing code chunks ...
1 : echo term verbatim
Error: chunk 1
Error in parse(text = chunk) : unexpected numeric constant in:
"height = scan()
64 62"
Right.
Sweave is trying to parse the whole chunk.
It cannot parse "64 62 66 65 62". (And the command line cannot parse it
either - try typing it at the R prompt.)
If you put each number on a separate line, Sweave will parse it, but when
scan() runs, it will prompt for input and accept it from STDIN just as
when run from the command line. Which probably isn't what you want.
I'd guess the path of least resistance is to have a bit of deception.
Use two chunks - one like that above but with eval=F and another with
eval=T,echo=F with code like this
tcon <- textConnection(" 64 62 66 65 62
69 72 72 70" )
height = scan(tcon)
close(tcon)
...
If the deception doesn't please you, then use a file as in
example( scan )
to illustrate scan()
HTH,
Chuck
Comments would be appreciated. (And thanks to Ross Darnell for a lot of help
on another list.)
Cheers, Murray Jorgensen
--
Dr Murray Jorgensen http://www.stats.waikato.ac.nz/Staff/maj.html
Department of Statistics, University of Waikato, Hamilton, New Zealand
Email: m...@waikato.ac.nz Fax 7 838 4155
Phone +64 7 838 4773 wk Home +64 7 825 0441 Mobile 021 0200 8350
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
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