move.ffdf: Moves all the columns of ffdf data.frames into a directory

In ffbase: Basic Statistical Functions for Package 'ff'

Description

move.ffdf saves all columns into the given dir. Each column is stored as with filename <ffdfname>$<colname>.ff. If you want to store the data for an other session please use save.ffdf or pack.ffdf

Usage

move.ffdf(
  x,
  dir = ".",
  name = as.character(substitute(x)),
  relativepath = FALSE
)

Arguments

x	ffdf data.frame to be moved
dir	path were all of supplied ffdf's, will be saved. It will be created if it doesn't exist.
name	name to be used as data.frame name
relativepath	If TRUE the ffdf will contain relativepaths. Use with care...

See Also

load.ffdf save.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.