dimnames.ff: Getting and setting dimnames

In ff: Memory-Efficient Storage of Large Data on Disk and Fast Access Functions

Getting and setting dimnames

Description

For ff_arrays you can set dimnames.

Usage

  ## S3 method for class 'ff_array'
dimnames(x)
  ## S3 replacement method for class 'ff_array'
dimnames(x) <- value

Arguments

x	a ff array (or matrix)
value	a list with length(dim(x)) elements (either NULL of character vector of length of dimension

Details

if vw is set, dimnames.ff_array returns the appropriate part of the names, but you can't set dimnames while vw is set. dimnames returns NULL for ff_vectors and setting dimnames for ff_vector is not allowed, but setting names is.

Value

dimnames returns a list, see dimnames

Author(s)

Jens Oehlschlägel

See Also

dimnames, dim.ff , names.ff , vw, virtual

Examples

  x <- ff(1:12, dim=c(3,4), dimnames=list(letters[1:3], LETTERS[1:4]))
  dimnames(x)
  dimnames(x) <- list(LETTERS[1:3], letters[1:4])
  dimnames(x)
  dimnames(x) <- NULL
  dimnames(x)
  rm(x); gc()

ff documentation built on April 4, 2025, 6:05 a.m.