From smckinney at bccrc.ca  Wed Nov 29 19:44:35 2006
From: smckinney at bccrc.ca (Steven McKinney)
Date: Wed, 29 Nov 2006 10:44:35 -0800
Subject: [Rd] rm() deletes 'c' if c('a','b') is the argument (PR#9399)
References: <20061129183537.0F42D5734F@slim.kubism.ku.dk>
Message-ID: <0BE438149FF2254DB4199E2682C8DFEB0235F9FA@crcmail1.BCCRC.CA>

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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[Rd] rm() deletes 'c' if c('a','b') is the argument (PR#9399)
Steven McKinney