Hi, people. This is R 2.2.1 under i686 Linux:
> attributes(as.vector(data.frame(a=1)))
$names
[1] "a"
$row.names
[1] "1"
$class
[1] "data.frame"
?attribute says:
'as.vector', a generic, attempts to coerce its argument into a
vector of mode 'mode' (the default is to coerce to whichever mode
is most convenient). The attributes of 'x' are removed.
The last sentence could be amended to say that the attributes of 'x' are
removed "if the coercion succeeds". As currently written, it may be
interpreted as meaning that the attributes are removed unconditionally.
--
Fran?ois Pinard http://pinard.progiciels-bpi.ca