load.ffdf: Loads ffdf data.frames from a directory

In ffbase: Basic Statistical Functions for Package 'ff'

Description

load.ffdf loads ffdf data.frames from the given dir, that were stored using save.ffdf. Each column is stored as with filename <ffdfname>$<colname>.ff. All variables are stored in .RData in the same directory. The data can be loaded by starting a R session in the directory or by using load.ffdf.

Usage

load.ffdf(dir, envir = parent.frame())

Arguments

dir	path from where the data should be loaded
envir	environment where the stored variables will be loaded into.

See Also

load.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.