[R] regular expression question

[Erin Hodgess]

Dear R People:

I have a data frame with the following column names:

> names(funky)
 [1] "UHD.1"   "UHD.2"   "UHD.3"   "UHD.4"   "L..W..1" "L..W..2" "L..W..3"
 [8] "L..W..4" "B..W..1" "B..W..2" "B..W..3" "B..W..4" "W..B..1" "W..B..2"
[15] "W..B..3" "W..B..4" "B..G..1" "B..G..2" "B..G..3" "B..G..4"


I would like to extract the letters from them; no periods, no numbers.

I tried the following:

> grep("[A:Z]",names(funky))
integer(0)

But this doesn't do it.

I've also been experimenting with strsplit, but no luck yet.

Any help would be much appreciated.

Thanks,
Sincerely,
Erin


-- 
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com