R devel - Apr 2011 - Compression of largish expression array files in the DAAGbio/inst/doc directory?

The inst/doc directory of the DAAG package has 6 files coral551.spot, ... that
are around 0.85 MB each.  It would be useful to be able to zip then, but that
as matters stand interferes with the use of the Sweave file that uses them to
demonstrate input of expression array data that is in the "spot"
format.  They
do not automatically get unzipped when required.  I have checked that 
read.maimages (in limma) does not, unless I have missed something, have 
an option for reading zipped files.  Is there any way to get around this without
substantially complicating the exposition in marray-notes.pdf (also in the
inst/doc subdirectory)?

John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Mathematics & Its Applications, Room 1194,
John Dedman Mathematical Sciences Building (Building 27)
Australian National University, Canberra ACT 0200.
http://www.maths.anu.edu.au/~johnm

As far as I can see read.maimages is built on top of R's own 
file-reading facilties, and they all read compressed (but not zipped) 
files as from R 2.10.0.

So simply use

gzip -9 coral55?.spot

and rename the files back to *.spot.

If you need more compression, use xz -9e.  (You can also do this in R: 
readLines() on the file, writeLines() using gzfile or xzfile.)

You will need to make the package 'Depends: R (>= 2.10)'.

On Sat, 9 Apr 2011, John Maindonald wrote:
> The inst/doc directory of the DAAG package has 6 files coral551.spot, ...
that
> are around 0.85 MB each.  It would be useful to be able to zip then, but
that
> as matters stand interferes with the use of the Sweave file that uses them
to
> demonstrate input of expression array data that is in the "spot"
format.  They
> do not automatically get unzipped when required.  I have checked that
> read.maimages (in limma) does not, unless I have missed something, have
> an option for reading zipped files.  Is there any way to get around this
without
> substantially complicating the exposition in marray-notes.pdf (also in the
> inst/doc subdirectory)?
>
> John Maindonald             email: john.maindonald at anu.edu.au
> phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
> Centre for Mathematics & Its Applications, Room 1194,
> John Dedman Mathematical Sciences Building (Building 27)
> Australian National University, Canberra ACT 0200.
> http://www.maths.anu.edu.au/~johnm
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
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