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0x30b2498
2016 Aug 05
2
Extra copies of objects in environments when using $ operator?
My understanding is that R will not make copies of lists if there is
only one reference to the object. However, I've encountered a case
where R does make copies, even though (I think) there should be only
one reference to the object. I hope that someone could shed some light
on why this is happening.
I'll start with a simple example. Below, x is a list with one element,
and changing that
2016 Aug 05
0
Extra copies of objects in environments when using $ operator?
...1148c1708>"
> e$x[[1]] <- 2
> # tracemem[0x1148c1708 -> 0x11b2fc1b8]:
Currently e$x marks values as immutable if they have any references by
setting NAMED to 2. You can see this with
> e <- new.env(parent = emptyenv())
> e$x <- list(1)
> .Internal(inspect(e))
@30b2498 04 ENVSXP g0c0 [NAM(1)] <0x30b2498>
ENCLOS:
@2600e98 04 ENVSXP g0c0 [MARK,NAM(2)] <R_EmptyEnv>
HASHTAB:
@2e41540 19 VECSXP g0c7 [] (len=29, tl=1)
@25c9628 00 NILSXP g0c0 [MARK,NAM(2)]
@25c9628 00 NILSXP g0c0 [MARK,NAM(2)]
@25c9628 00 NILSXP g0c0 [MARK,NAM(2)]
@...