This is because RObjToCPtr is not quite careful enough with NAMED,
rather than an issue with as.XXX
tmp.c: void tmp(double *x) { x[0]=1; return; }
> f <- function(x) x
> x <- 0
> .C("tmp", f(x), DUP=FALSE)
[[1]]
[1] 1
> x
[1] 1
> x <- 0
> y <- x
> .C("tmp", x, DUP=FALSE)
[[1]]
[1] 1
> y
[1] 1
Martin
Prof Brian Ripley <[EMAIL PROTECTED]> writes:
> On Tue, 11 Jul 2006, Prof Brian Ripley wrote:
>
>> On Fri, 7 Jul 2006, Thomas Lumley wrote:
>
>> > On Fri, 7 Jul 2006, Martin Morgan wrote:
>
> [...]
>
>> > > More generally, perhaps as.vector might not duplicate when mode(x) ==
>> > > mode ?
>> >
>> > This isn't a trivial change, because mode(x)==mode does not guarantee
>> > that as.vector(x, mode) has no effect. For example, with mode="numeric"
>> > it
>> > removes attributes.
>>
>> And with mode="list" it does not (although that is not as documented).
>> We can certainly do better. [This is another of those cases where 'mode'
>> is confusing, and in fact it would be typeof(x) == mode.]
>
> Aargh: of course I should have guessed that quite a few people have
> written code that assumes that e.g. as.double() duplicates. The first I
> came across is a .Fortran call in smooth.spline with DUP=FALSE which
> despite all the warnings changes its 'w' argument and hence the return
> result from smooth.spline if as.double is made more efficient.
>
> I really have no desire to spend any more time tracking down problems
> caused by such rogue code, so I am going to leave this as is (with as.list
> somewhat more efficient but the as.vector functions always duplicating).
>
> --
> Brian D. Ripley, [EMAIL PROTECTED]
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
>
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