One solution is likely to be the Omegahat package Rcompression. Otherwise, R does have internal facilities to do internal (gzip) compression and decompression (e.g. see the end of src/main/connections.c), and you could make creative use of serialization to do the compression.
On Thu, 28 Feb 2008, Ramon Diaz-Uriarte wrote: > Dear All, > > I'd like to be able to have R store (in a list component) a compressed > data set, and then write it out uncompressed. gzcon and gzfile work in > exactly the opposite direction. What would be a good way to handle > this? > > Details: > ---------- > > We have a package that uses C; part of the C output is a large sparse > matrix. This is never manipulated directly by R, but always by the C > code. However, we need to store that data somewhere (inside an R > object) for further calls to the functions in our package. We'd like > to store that matrix as part of the R object (say, as an element of a > list). Ideally, it would be stored in as compressed a way as possible. > Then, when we need to use that information, it would be decompressed > and passed to the C function. > > I guess one way to do it is to have C deal with the compression and > uncompression (e.g., using zlib or the bzip2 libraries) and then use > readBin, etc, from R. But, if I can, I'd like to avoid our C code > having to call zlib, etc, so as to make our package easily portable. As from R 2.7.0 you will be able to make use of zlib on effectively all platforms, since it has a public interface on Windows. > > Thanks, > > R. > > -- > Ramon Diaz-Uriarte > Statistical Computing Team > Structural Biology and Biocomputing Programme > Spanish National Cancer Centre (CNIO) > http://ligarto.org/rdiaz -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
