> .Internal(inspect(1:10))
@300e4e8 13 INTSXP g0c0 [NAM(3)] 1 : 10 (compact)
> .Internal(inspect(seq(1,10)))
@3b6e1f8 13 INTSXP g0c4 [] (len=10, tl=0) 1,2,3,4,5,...
> system.time(1:1e7)
user system elapsed
0 0 0
> system.time(seq(1,1e7))
user system elapsed
0.05 0.00 0.04
It seems that result of function 'seq' doesn't use compact internal
representation. However, looking at the code of function 'seq.default',
seq(1,n) produces 1:n. What is going on?
> h <- seq.default
> environment(h) <- .GlobalEnv
> library(compiler)
> enableJIT(0)
[1] 3
> .Internal(inspect(h(1,10)))
@375ade8 13 INTSXP g0c0 [NAM(3)] 1 : 10 (compact)
A non-byte-compiled version of function 'seq.default' can produce object that
uses compact internal representation.
> sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: i386-w64-mingw32/i386 (32-bit)
Running under: Windows XP (build 2600) Service Pack 3
Matrix products: default
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] compiler stats graphics grDevices utils datasets methods
[8] base
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