Frank E Harrell Jr wrote:
Dear Colleagues:
In producing a book or a handout I sometimes cut out a large part of
the printed output of an R function, substituting ... for that chunk.
Deleting non-essential output saves paper. It would be nice to have a
capability in Sweave to allow the user to specify a starting and an
ending regular expression that would identify consecutive lines of
output to replace with ..., without showing the extra code required to
do this to the user. I would want the LaTeX output, other than the
omission, to appear the same as if the section were not omitted. Does
anyone have an idea of how to do this elegantly?
Hello,
You could use the same trick that is sometimes used to embed lattice
calls into print calls (see the grid vignette for example)
\documentclass[a4paper]{article}
\begin{document}
<<aa,eval=FALSE,echo=T>>=
rnorm( 200 )
<<echo=F>>=
txt <- capture.output( {
<<aa>>
} )
if( length(txt) > 10 ){
txt <- c( txt[1:10], "..." )
}
cat( txt, sep = "\n" )
@
\end{document}
By the way I just discovered the SweaveListingUtils package by Peter
Ruckdeschel (on CRAN), which produces beautifully printed R code in
Sweave code chunks. I put some info about it at
http://biostat.mc.vanderbilt.edu/SweaveTemplate which has our Sweave
template for statistical reports.
You might also be interested by the driver that comes with the highlight
package (not yet on cran though, but the r-forge version is stable enough).
> install.packages("highlight", repos="http://R-Forge.R-project.org";)
> require( highlight )
> Sweave( file, driver = HighlightWeaveLatex() )
*||*
Thanks
Frank
--
Romain Francois
Independent R Consultant
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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