ff: dimnames.ffdf – R documentation

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dimnames.ffdf

Getting and setting dimnames of ffdf

Description

Getting and setting dimnames, columnnames or rownames

Usage

## S3 method for class 'ffdf'
dimnames(x)
  ## S3 replacement method for class 'ffdf'
dimnames(x) <- value
  ## S3 method for class 'ffdf'
names(x)
  ## S3 replacement method for class 'ffdf'
names(x) <- value
  ## S3 method for class 'ffdf'
row.names(x)
  ## S3 replacement method for class 'ffdf'
row.names(x) <- value

Arguments

`x`	a `ffdf` object
`value`	a character vector, or, for dimnames a list with two character vectors

Details

It is recommended not to assign row.names to a large ffdf object.

Value

The assignment function return the changed ffdf object. The other functions return the expected.

Author(s)

Jens Oehlschlägel

Examples

ffd <- as.ffdf(data.frame(a=1:26, b=letters, stringsAsFactors = TRUE))
  dimnames(ffd)
  row.names(ffd) <- letters
  dimnames(ffd)
  ffd
  rm(ffd); gc()

ff

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

v4.0.4

GPL-2 | GPL-3 | file LICENSE

Authors

Daniel Adler [aut], Christian Gläser [aut], Oleg Nenadic [aut], Jens Oehlschlägel [aut, cre], Martijn Schuemie [aut], Walter Zucchini [aut]

Initial release

2020-10-13