[R] sequences extraction

jim holtman
Fri, 20 Apr 2007 11:23:19 -0000

Here is one way of doing it:

> a
[1]  1  2  3  6 10 11 13
> b <- c(FALSE, diff(a) != 1)
> cumsum(b)
[1] 0 0 0 1 2 2 3
> split(a, cumsum(b))
$`0`
[1] 1 2 3

$`1`
[1] 6

$`2`
[1] 10 11

$`3`
[1] 13

>


On 4/20/07, Bruno C. <bruno.c at inwind.it> wrote:
> Hello,
>
> I need to extract sequences from an ordered vector.
> For example, if
> a<-c(1,2,3,6,10,11,13)
> I need to get the followings 4 vectors
> (1,2,3),(6),(10,11),(13)
>
> Thank You
> -Bruno
>
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?