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clone physically duplicates objects and can additionally change
some features, e.g. length.
clone(x, ...)# S3 method for default
clone(x, ...)
an object that is a deep copy of x
x an R object
further arguments to the generic
clone(default): default method uses R's C-API 'duplicate()'
Jens Oehlschlägel
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.
clone.ff, copy_vector()
x <- 1:12
y <- x
still.identical(x, y)
y[1] <- y[1]
still.identical(x, y)
y <- clone(x)
still.identical(x, y)
rm(x, y); gc()
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