Gabor Grothendieck <ggrothendieck <at> myway.com> writes:
:
: åæ <xmeng <at> capitalbio.com> writes:
:
: : Thanks a lot for your timely rely.
: : I still wonder whether I can use "a":"d" instead of 1:4.
: : I remember I fulfill it successfully according to the guidance of some
: materials on R,but fail to find it now.
:
: You could define your own seq function and operator:
:
: R> "%:%" <- seq.character <- function(x,y) letters[letters >= x & letters <=
y]
: R> seq("a", "d")
: [1] "a" "b" "c" "d"
: R> "a" %:% "d"
: [1] "a" "b" "c" "d"
And just as a follow up to my own post, if you want to make this a bit more
general you might use ascii in place of letters where ascii is defined in:
http://www.r-project.org/nocvs/mail/r-help/2002/0952.html
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