ramattribs | R Documentation |
Functions ramclass
and ramattribs
return the respective virtual attributes, that determine which class (and attributes) an ff object receives when subscripted (or coerced) to ram.
ramclass(x, ...) ## S3 method for class 'ff' ramclass(x, ...) ## Default S3 method: ramclass(x, ...) ramattribs(x, ...) ## S3 method for class 'ff' ramattribs(x, ...) ## Default S3 method: ramattribs(x, ...)
x |
|
... |
further arguments (not used) |
ramclass
and ramattribs
provide a general mechanism to store atomic classes in ff objects,
for example factor
– see levels.ff
– and POSIXct
, see the example.
ramclass
returns a character vector with classnames and ramattribs
returns a list with names elemens just like attributes
.
The vectors ramclass_excludes
and ramattribs_excludes
name those attributes, which are not exported from ff to ram objects when using as.ram
.
Jens Oehlschlägel
ff
, virtual
, as.ram
, levels.ff
, attributes
, DateTimeClasses
x <- ff(as.POSIXct(as.POSIXlt(Sys.time(), "GMT")), length=12) x ramclass(x) ramattribs(x) class(x[]) attributes(x[]) virtual(x)$ramattribs$tzone = NULL attributes(x[]) rm(x); gc()
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