Hi,
I have two .rda files that I need to include in a package. I've placed
them both in a data directory
after save() the are around 150Kb each.
When I try to check the package I get the following warning
Warning: large data file(s) saved inefficiently:
size ASCII compress
zagoskin.rda 137Kb FALSE none
Note: significantly better compression could be obtained
by using R CMD build --resave-data
old_size new_size compress
modpoll.rda 124Kb 78Kb xz
zagoskin.rda 137Kb 6Kb bzip2
Both of these files modpoll.rda and zagoskin.rda have already been
compressed from megabytes down to Kb.
Also,, the instructions "R CMD build --resave-data" doesnt do anything
that I can see so I must be using it wrong.
Is there a piece of the puzzle I am missing or instructions better than
these: I tried LazyDataCompression and my
data.rdb is 90Kb.
"Package *tools* has a couple of functions to help with data images:
checkRdaFiles reports on the way the image was saved, and resaveRdaFiles will
re-save with a different type of compression, including choosing the best
type for that particular image.
Some packages using LazyData will benefit from using a form of
compression other than gzip in the installed lazy-loading database. This
can be selected by the --data-compress option to R CMD INSTALL or by using
the LazyDataCompression field in the DESCRIPTION file. Useful values are
bzip2, xz and the default, gzip. The only way to discover which is best is
to try them all and look at the size of the pkgname/data/Rdata.rdb file."
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