[R] Finding "runs" of TRUE in binary vector

[Kjetil Brinchmann Halvorsen]

Sean Davis wrote:

> I have a binary vector and I want to find all "regions" of that vector 
> that are runs of TRUE (or FALSE).
>
> > a <- rnorm(10)
> > b <- a<0.5
> > b
>  [1]  TRUE  TRUE  TRUE FALSE  TRUE FALSE  TRUE  TRUE  TRUE  TRUE
>
> My function would return something like a list:
> region[[1]] 1,3
> region[[2]] 5,5
> region[[3]] 7,10
>
> Any ideas besides looping and setting start and ends directly?
>
?rle


> Thanks,
> Sean
>
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-- 

Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
               --  Mahdi Elmandjra




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