R help - Oct 2012 - Simple - Finding vector in a vector

Hi,

just a simple question.
Assumed i have a vector,

FALSE  TRUE  TRUE  TRUE FALSE  TRUE FALSE  TRUE FALSE
or
NA  1  1  1 NA  1 NA  1 NA

what i need is the position where an element is the same - three (or
in general multiple) times in a row.

in this case: i want to get the position where it is TRUE TRUE TRUE or 1 1 1
it doesn't matter if it is the first, middle or last element. So the
output could be 2 or 3 or 4

My idea would be to lag the vector and calc differences... but i would
prefer any build in (or time saving) function. :)

thanks,

Nico

Hello,

See ?rle

Hope this helps,

Rui Barradas
Em 08-10-2012 13:55, Mike Spam escreveu:
> Hi,
>
> just a simple question.
> Assumed i have a vector,
>
> FALSE  TRUE  TRUE  TRUE FALSE  TRUE FALSE  TRUE FALSE
> or
> NA  1  1  1 NA  1 NA  1 NA
>
> what i need is the position where an element is the same - three (or
> in general multiple) times in a row.
>
> in this case: i want to get the position where it is TRUE TRUE TRUE or 1 1
1
> it doesn't matter if it is the first, middle or last element. So the
> output could be 2 or 3 or 4
>
> My idea would be to lag the vector and calc differences... but i would
> prefer any build in (or time saving) function. :)
>
> thanks,
>
> Nico
>
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