Getting length of a ffdf dataframe — length.ffdf • ff

Getting "length" (number of columns) of a ffdf dataframe

# S3 method for class 'ffdf'
length(x)

Arguments

x: an ffdf object

Value

integer number of columns

Author

Jens Oehlschlägel

See also

dim.ffdf, length.ff, ffdf

Examples

  length(as.ffdf(data.frame(a=1:26, b=letters, stringsAsFactors = TRUE)))
#> [1] 2
  gc()
#>           used (Mb) gc trigger  (Mb) max used  (Mb)
#> Ncells 1160715 62.0    1994352 106.6  1994352 106.6
#> Vcells 2162382 16.5    8790397  67.1  8790397  67.1