R help - Dec 2009 - Create sequence given start and end vector

How can I create the following without the 'for' loop?

start=c(1,10,20)

end=c(4,15,27)

out=c()

for (i in 1:length(start)) {
	out=c(out,start[i]:end[i])
	}
out
 [1]  1  2  3  4 10 11 12 13 14 15 20 21 22 23 24 25 26 27

I know there must be an easier (and, hopefully, faster) way.

Many thanks in advance,
Kevin Ummel

Central European University
Department of Environmental Science and Policy

Hi Kevin,

Here is a suggestion using mapply():

start <- c(1,10,20)
end <- c(4,15,27)
do.call(c, mapply( seq, start, end))

See ?mapply and ?do.call for more information.

HTH,
Jorge


On Sat, Dec 12, 2009 at 2:27 PM, Kevin Ummel <> wrote:
> How can I create the following without the 'for' loop?
>
> start=c(1,10,20)
>
> end=c(4,15,27)
>
> out=c()
>
> for (i in 1:length(start)) {
>        out=c(out,start[i]:end[i])
>        }
> out
>  [1]  1  2  3  4 10 11 12 13 14 15 20 21 22 23 24 25 26 27
>
> I know there must be an easier (and, hopefully, faster) way.
>
> Many thanks in advance,
> Kevin Ummel
>
> Central European University
> Department of Environmental Science and Policy
>
> ______________________________________________
> R-help@r-project.org mailing list
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