[Rd] change in behavior of <<-
Vincent Carey 525-2265
stvjc at channing.harvard.edu
Tue Mar 30 20:40:08 CEST 2004
There has been a change to the behavior of <<-.
See the error thrown at the bottom of the transcript
below. I don't believe this is an intended change.
==========
older version of R-devel
==========
> version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status alpha
major 1
minor 9.0
year 2004
month 03
day 09
language R
> x <<- list()
> x[["a"]] <<- list()
> x[["a"]][["b"]] <<- 3
> x
$a
$a$b
[1] 3
===========
more recent version of R-devel:
===========
> version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status beta
major 1
minor 9.0
year 2004
month 03
day 30
language R
> x <<- list()
> x
list()
> x[["a"]] <- list()
> x
$a
list()
> x[["a"]] <- 2
> x
$a
[1] 2
> x[["a"]] <<- 2
Error: Object "x" not found
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