ffbase: move.ffdf – R documentation

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move.ffdf

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

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...

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

Basic Statistical Functions for Package 'ff'

v0.13.3

GPL-3

Authors

Edwin de Jonge, Jan Wijffels, Jan van der Laan

Initial release