[R] find jumps in vector of repeats

[Bert Gunter]

Hint: ?diff

-- Bert

On Fri, Oct 18, 2013 at 5:17 PM, Benton, Paul
<hpaul.benton08 at imperial.ac.uk> wrote:
> Hello all,
>
> I'm not really sure how to search for this in google/Rseek so there is probably a command to do it. I also know I could write an apply loop to find it but thought I would ask all you lovely R gurus.
>
> I have a very long vector (length=1855190) it looks something like this
>
> 1111...2222...3333....etc so it would be something equivalent of doing:
> rep(c(1,2,3,4,5), c(10,30,24,65,3))
>
> How can I find the index of where the step/jump is? For example using the above I would get an index of 0, 10, 40, 64, 129
>
> Any help would be greatly appreciated.
>
> Cheers,
>
> Paul
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

(650) 467-7374