[R] Pattern Matching help
Samir Mishra
sqmishra at excite.com
Wed Jan 17 13:04:31 CET 2001
Thanks in advance for any help I can get on this.
I'm trying to change variable names between 2 systems - R and old SPSS,
Oracle. I'm using the grep() and gsub() commands but I'm getting the
following result -
> test.dat <- c("a", "b.c", "d.e.f", "p_q,r")
> test.dat
[1] "a" "b.c" "d.e.f" "p_q,r"
> grep(",", test.dat, value = TRUE, extended = FALSE)
[1] "p_q,r"
> grep("_", test.dat, value = TRUE, extended = FALSE)
[1] "p_q,r"
> #NOT WHAT I WANT, I EXPECT TO GET ONLY ELEMENTS 2 & 3 RETURNED
> grep(".", test.dat, value = TRUE, extended = FALSE)
[1] "a" "b.c" "d.e.f" "p_q,r"
And similarly, with gsub(), I get -
> gsub(",", "_", test.dat, extended = FALSE)
[1] "a" "b.c" "d.e.f" "p_q_r"
> gsub("_", ".", test.dat, extended = FALSE)
[1] "a" "b.c" "d.e.f" "p.q,r"
> #NOT WHAT I WANT
> gsub(".", "_", test.dat, extended = FALSE) #NOT WHAT I WANT
[1] "_" "___" "_____" "_____"
Am I doing something wrong?
Samir.
> version
platform i386-pc-mingw32
arch x86
os Win32
system x86, Win32
status
major 1
minor 2.0
year 2000
month 12
day 15
language R
Samir Mishra
===========================================
Please send replies to :
sqmishra at acm.org
===========================================
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