Hi:

Josh's solution is much simpler (and more practical, no doubt) than the one
below, but I wanted to experiment with creating sequences using a vector of
start indices and a corresponding vector of end indices:

b <- 1:3       # vector of start indices
e <- 3:5       # vector of end indices

The idea is to vectorize the seq() function, use mapply on it and then
flatten the result to a vector. Intuitively obvious :)

vseq <- Vectorize(seq)
mapply(vseq, b, e)       # close...
     [,1] [,2] [,3]
[1,]    1    2    3
[2,]    2    3    4
[3,]    3    4    5
as.vector(mapply(vseq, b, e))     # ja...
[1] 1 2 3 2 3 4 3 4 5

HTH,

Dennis

On Mon, Jul 19, 2010 at 8:25 PM, Suphajak Ngamlak <
Suphajak@phatrasecurities.com> wrote:

> I would like to create a vector that is a sequence from 2 vectors. Could
> anyone provide suggestion on this?
>
> For example
>
> > a<-c(1,2,3)
> > b<-a+2
> > b
> [1] 3 4 5
>
> I would like to have a vector that is a sequence which starting from a
> and ending at b
>
> c = c(1:3,2:4,3:5)
> c = c(1,2,3,2,3,4,3,4,5)
>
> Thank you
>
> Best Regards,
>
> Suphajak Ngamlak
> Equity and Derivatives Trading
> Phatra Securities Public Company Limited
> Tel: +662-305-9179
> Email: suphajak@phatrasecurities.com
>
>
>
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>
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