Good day,
Save sometimes chooses a compression method which causes a warning during
package checking. An example of this is:
measurements <- matrix(round(rnorm(2000*190), 2), nrow = 2000, ncol = 190)
classes <- factor(sample(LETTERS[1:2], 190, replace = TRUE))
save(measurements, classes, file = "data/experiment.RData")
then, when the package is checked,
* checking data for ASCII and uncompressed saves ... WARNING
Note: significantly better compression could be obtained
by using R CMD build --resave-data
old_size new_size compress
experiment.RData 689Kb 447Kb bzip2
Could save and R CMD check consistently agree on a suitable compression scheme?
Could R CMD check not emit warnings if the data is already small and the
alternative compression doesn't reduce the size much, such as for this example?
Perhaps it could only emit warnings when the data file is more than 5 MB and
the alternative scheme's resulting file is 50% or more than the size of the
existing file. There is also no explanation in Section 1.1.6 Data in Packages
of Writing R Extensions that compression of data files is implicitly mandatory
for R packages to pass the checking process these days.
--------------------------------------
Dario Strbenac
University of Sydney
Camperdown NSW 2050
Australia
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