Compatibility functions (to package ff) for getting and setting physical and virtual attributes.
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physical(x) virtual(x) physical(x) <- value virtual(x) <- value ## Default S3 method: physical(x) ## Default S3 method: virtual(x) ## Default S3 replacement method: physical(x) <- value ## Default S3 replacement method: virtual(x) <- value ## S3 method for class 'physical' print(x, ...) ## S3 method for class 'virtual' print(x, ...)
a ff or ram object
a list with named elements
ff objects have physical and virtual attributes, which have different copying semantics:
physical attributes are shared between copies of ff objects while virtual attributes might differ between copies.
as.ram will retain some physical and virtual atrributes in the ram clone,
as.ff can restore an ff object with the same attributes.
virtual returns a list with named elements
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