[R] Sequence detection longer than a certain value

[Bert Gunter]

z <- rle(VI<1)

gets you most of the way there. ?rle will tell you what z is so that
you can then use it to go the rest of the way.

-- Bert

On Tue, Aug 21, 2012 at 10:54 AM, inti luna <ilunalist at gmail.com> wrote:
> Hello,
>
> I have 2 variable: one is an "id" sequence from 1:1000 and the other is
> variable with real values "VI" from -15.0 to 20.0 and I want to detect id
> values that have indicator values less than a certain threshold, for
> example (x=1) BUT that are in sequence equal or longer than 5.
>
> For instance, in the following column I want to recognize the sequence from
> "id" 4 to 8 that are values with a "VI" values lower than 1 in a sequence
> of 5, and not the id values 1 and 2 which are values with VI lower than my
> threshold but the sequence is lower than 5.
>
> id VI
>
> 1 -10
> 2  -4
> 3  5
> 4 -2
> 5 -5
> 6 -3
> 7 -2
> 8 -1
> 9  4
> 10 8
>
>  Any help would be appreciated!
>
> Inti
>
>         [[alternative HTML version deleted]]
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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