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3569488
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?
...9628 00 NILSXP g0c0 [MARK,NAM(2)]
@25c9628 00 NILSXP g0c0 [MARK,NAM(2)]
@25c9628 00 NILSXP g0c0 [MARK,NAM(2)]
@30b3370 02 LISTSXP g0c0 []
TAG: @2637870 01 SYMSXP g0c0 [MARK,NAM(2)] "x"
@3569488 19 VECSXP g0c1 [NAM(1)] (len=1, tl=0) ## <--- NAM = 1
@35694e8 14 REALSXP g0c1 [NAM(2)] (len=1, tl=0) 1
...
> e$x
[[1]]
[1] 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 g0c...