Bernd Weiss wrote:
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> skestin schrieb:
> | I suppose it's very simple but I can't find the way to generate a
> sequence of
> | characters, e.g. from "a" to "z".
> | Could you please help me with this?
>
> ?letters
> letters
>
"letters" is okay for just that sequence, or parts of it, but might
not be general enough for the original poster...
I just discovered 'charToInt' and 'intToChar' in the R.oo package:
> intToChar(65:68)
[1] "A" "B" "C" "D"
Then you can define cseq:
> cseq =
function(from,to,by=1){
from=charToInt(from)
to=charToInt(to)
intToChar(seq(from,to,by))
}
and do:
> cseq('A','G')
[1] "A" "B" "C" "D" "E" "F" "G"
> cseq('A','G',2)
[1] "A" "C" "E" "G"
> cseq('a','A',-2)
[1] "a" "_" "]" "[" "Y" "W" "U" "S" "Q" "O" "M" "K" "I" "G" "E" "C" "A"
Note this uses ASCII codes and not whatever your language alphabet is.
I'd overload ':' for this and then you could do 'a':'z', but ':' heads
into .Primitive territory...
Barry
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