Martin Maechler wrote:
>
> >> more verbously, all NULL objects in R are identical, or as the
> >> help page says, there's only ``*The* NULL Object'' in R,
> >> i.e., NULL cannot get any attributes.
> >>
>
> WK> yes, but that's not the issue. the issue is that names(x)<- seems
> "WK" == Wacek Kusnierczyk
> on Mon, 23 Mar 2009 16:11:04 +0100 writes:
WK> Martin Maechler wrote:
>>
>> [.. omitted part no longer relevant ]
>>
WK> however, the following has a different pattern:
>> >>
WK> x = NULL
WK> dput(x)
WK>
Martin Maechler wrote:
>
> [.. omitted part no longer relevant ]
>
> WK> however, the following has a different pattern:
> >>
> WK> x = NULL
> WK> dput(x)
> WK> # NULL
> WK> names(x) = character(0)
> WK> # error: attempt to set an attribute on NULL
> >>
> "WK" == Wacek Kusnierczyk
> on Mon, 23 Mar 2009 10:56:37 +0100 writes:
WK> Martin Maechler wrote:
>>> "WK" == Wacek Kusnierczyk
>>>
>>>
WK> somewhat related to a previous discussion [1] on how 'names<-' would
WK> sometimes modify its argument i
Martin Maechler wrote:
>> "WK" == Wacek Kusnierczyk
>>
>>
> WK> somewhat related to a previous discussion [1] on how 'names<-' would
> WK> sometimes modify its argument in place, and sometimes produce a
> modified
> WK> copy without changing the original, here
> "WK" == Wacek Kusnierczyk
> on Mon, 23 Mar 2009 09:52:19 +0100 writes:
WK> somewhat related to a previous discussion [1] on how 'names<-' would
WK> sometimes modify its argument in place, and sometimes produce a modified
WK> copy without changing the original, here's ano
somewhat related to a previous discussion [1] on how 'names<-' would
sometimes modify its argument in place, and sometimes produce a modified
copy without changing the original, here's another example of how it
becomes visible to the user when r makes or doesn't make a copy of an
object:
x = N
