Unpacks previously stored ffdf data.frame into a directory
unpack.ffdf restores ffdf data.frames into the given dir, that were stored using pack.ffdf.
If dir is NULL (the default) the data.frames will restored in a temporary directory.
if
unpack.ffdf(file, dir = NULL, envir = parent.frame())
file |
packaged file, zipped or tar.gz. |
dir |
path where the data will be saved and all columns of supplied |
envir |
the environment where the stored variables should be loaded into. |
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.