R: Getting and setting dimnames of ffdf

dimnames.ffdf {ff} | R Documentation

## 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

### See Also

`ffdf`, `dimnames.ff`, `rownames`, `colnames`

### Examples

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

[Package ff version 2.2-13 Index]