A small drawback to Gabor's proposal:
> "aa" %:% "dd"
[1] "b" "c" "d"
> "00" %:% "99"
character(0)
Defining it as a seq() method for characters is probably not a terribly good
idea, as one should expect it to work for any character vectors as input.
(One can argue that the function worked as `expected', I suppose...)
Best,
Andy
> From: Gabor Grothendieck
>
> 孟欣 <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"
>
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