Test if object is opened
Test whether an ff or ffdf object or a ff_pointer is opened.
is.open(x, ...) ## S3 method for class 'ff' is.open(x, ...) ## S3 method for class 'ffdf' is.open(x, ...) ## S3 method for class 'ff_pointer' is.open(x, ...)
TRUE or FALSE (or NA if not all components of an ffdf object are opened or closed)
Jens Oehlschlägel
x <- ff(1:12) is.open(x) close(x) is.open(x) rm(x); gc()
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