Vitalie Spinu wrote:
Hello Everyone!
NULL replacement will change expression object into list:
te <- expression(a=23*4, b=33-2)
te
expression(a = 23 * 4, b = 33 - 2)
te[["a"]] <- quote(blabla) #ok
te
expression(a = blabla, b = 33 - 2)
te[["a"]] <- NULL #change to list
te
$b
33 - 2
I am on w32, version 2.11.1 (2010-05-31)
That's certainly an inconsistency, still present in a recent R-devel
(but I haven't checked the latest beta). I don't know if it's a bug:
NULL assignments are handled specially in other situations (e.g. if te
was a list to start, the NULL assignment would remove the "a" entry).
A simple workaround is to use
te["a"] <- expression(NULL)
or te <- te[-1]
instead, depending on what you expected to happen.
Duncan Murdoch
Regards,
Vitally.
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