pack.ffdf: Packs ffdf data.frames into a compressed file

In ffbase: Basic Statistical Functions for Package 'ff'

Description

pack.ffdf stores ffdf data.frames into the given file for easy archiving and movement of data. The file can be restored using unpack.ffdf. If file ends with ".zip", the package will be zipped otherwise it will be tar.gz-ed.

Usage

pack.ffdf(file, ...)

Arguments

file	packaged file, zipped or tar.gz.
...	ff objects to be packed

See Also

save.ffdf unpack.ffdf

Examples

iris.ffdf <- as.ffdf(iris)

td <- tempfile()

# save the ffdf into the supplied directory
save.ffdf(iris.ffdf, dir=td)

# what in the directory?
dir(td)

#remove the ffdf from memory
rm("iris.ffdf")

# and reload the stored ffdf
load.ffdf(dir=td)

tf <- paste(tempfile(), ".zip", sep="")
packed <- pack.ffdf(file=tf, iris.ffdf)

#remove the ffdf from memory
rm("iris.ffdf")

# restore the ffdf from the packed ffdf
unpack.ffdf(tf)

ffbase documentation built on Feb. 27, 2021, 5:06 p.m.