unpack.ffdf: Unpacks previously stored ffdf data.frame into a directory

In ffbase: Basic Statistical Functions for Package 'ff'

Description

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

Usage

unpack.ffdf(file, dir = NULL, envir = parent.frame())

Arguments

file	packaged file, zipped or tar.gz.
dir	path where the data will be saved and all columns of supplied ffdf's. It will be created if it doesn't exist.
envir	the environment where the stored variables should be loaded into.

See Also

load.ffdf pack.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.