On Tue, Feb 3, 2009 at 10:56 PM, laurent <lgaut...@gmail.com> wrote:
> On Tue, 2009-02-03 at 13:30 -0800, Nathaniel Smith wrote:
>> why does EnvironmentSexp_ass_subscript (==
>> rpy2.rinterface.SexpEnvironment.__setitem__) copy the value it is
>> storing?
>>
>> PROTECT(sexp_copy = Rf_duplicate(sexp));
>> Rf_defineVar(sym, sexp_copy, rho_R);
>
> That's from the early development days, when I was getting very frequent
> segfaults. That was to be on the safe side since R itself is often doing
> a lot of copies; a second look at that (and try to minimize the number
> of copies) is on the ever growing to-do list...
Fair enough.
> # rinterface
> import rpy2.rinterface as ri
> ri.initr()
>
> x = ri.FloatSexpVector([1,2,3,4])
> x = ri.globalEnv.get("dim<-")(x, ri.IntSexpVector([2, 2]))
Right... dim<- is copying the vector and then returning the modified
copy. I want dim<- to mutate the vector in place, like it does when
you call it in R :-).
Since I sent that message, though, I have learned a bit more about the
quirky stuff R's runtime does, and am no longer convinced this is
possible in general... sigh.
-- Nathaniel
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