rm() deletes 'c' if c('a','b') is the argument (PR#9399)
That's because you are not using rm() correctly. From the help page:
Arguments:
...: the objects to be removed, supplied individually and/or as a
character vector
list: a character vector naming objects to be removed.
So if you pass an unnamed argument, rm() will assume you have some
objects in the .GlobalEnv with those names that you would like to
remove. If you want to pass a character vector, you have to name it
because the first argument is '...'.
> a <- 1:5
> b <- 2:10
> c <- "not a good variable name"
> rm(list=c("a","b"))
> c
[1] "not a good variable name"
> a <- 1:5
> b <- 2:10
> c <- "still not a good variable name"
> rm(a,b)
> c
[1] "still not a good variable name"
> a <- 1:5
> b <- 2:10
> c <- "still not a good variable name"
> rm("a","b")
> c
[1] "still not a good variable name"
NB: 'c' is not a good variable name because you are masking an existing
function.
An argument could be made that the explanation for the first argument is
not very exact.
Best,
Jim
Steven McKinney wrote:
Same behaviour seen on Apple Mac OSX 10.4.8 platform:
sessionInfo()
R version 2.4.0 Patched (2006-10-31 r39758)
powerpc-apple-darwin8.8.0
locale:
en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8
attached base packages:
[1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" "base"
other attached packages:
XML
"1.2-0"
ls()
[1] "getMonograph" "last.warning" "myfun"
a <- 1 b <- 2 c <- letters a
[1] 1
b
[1] 2
c
[1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"
rm(c('a', 'b'))
a
Error: object "a" not found
b
Error: object "b" not found
c
.Primitive("c")
ls()
[1] "getMonograph" "last.warning" "myfun"
a <- 1 b <- 2 d <- letters ls()
[1] "a" "b" "d" "getMonograph" "last.warning" "myfun"
rm(c('a', 'b'))
Warning message: remove: variable "c" was not found
ls()
[1] "d" "getMonograph" "last.warning" "myfun"
Steven McKinney
Statistician
Molecular Oncology and Breast Cancer Program
British Columbia Cancer Research Centre
email: smckinney at bccrc.ca
tel: 604-675-8000 x7561
BCCRC
Molecular Oncology
675 West 10th Ave, Floor 4
Vancouver B.C.
V5Z 1L3
Canada
-----Original Message-----
From: r-devel-bounces at r-project.org on behalf of hanl2 at wyeth.com
Sent: Wed 11/29/2006 10:35 AM
To: r-devel at stat.math.ethz.ch
Cc: R-bugs at biostat.ku.dk
Subject: [Rd] rm() deletes 'c' if c('a','b') is the argument (PR#9399)
Full_Name: Lixin Han
Version: 2.4.0
OS: Windows 2000
Submission from: (NULL) (155.94.110.222)
A character vector c('a','b') is supplied to rm(). As a result, 'c' is deleted
unintentionally.
a <- 1:5 b <- 'abc' c <- letters ls()
[1] "a" "b" "c"
rm(c('a','b'))
ls()
character(0)
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