Cloning ff and ram objects

Source: R/clone.R

clone physically duplicates objects and can additionally change some features, e.g. length.

clone(x, ...)

# Default S3 method
clone(x, ...)

Arguments

x

x an R object

...

further arguments to the generic

Value

an object that is a deep copy of x

Details

clone is generic. clone.default handles ram objects. Further methods are provided in package 'ff'. still.identical returns TRUE if the two atomic arguments still point to the same memory.

Methods (by class)

  • clone(default): default method uses R's C-API 'duplicate()'

See also

clone.ff, copy_vector()

Author

Jens Oehlschlägel

Examples


  x <- 1:12
  y <- x
  still.identical(x, y)
#> [1] TRUE
  y[1] <- y[1]
  still.identical(x, y)
#> [1] FALSE
  y <- clone(x)
  still.identical(x, y)
#> [1] FALSE
  rm(x, y); gc()
#>           used (Mb) gc trigger  (Mb) max used  (Mb)
#> Ncells 1280481 68.4    1943068 103.8  1943068 103.8
#> Vcells 8166234 62.4   22625036 172.7 25049960 191.2