[R] Find the first values in vector

[Henrique Dallazuanna]

Try this:

head(vec, sum(cumprod(vec)))

The positions:

which(head(vec, sum(cumprod(vec))))

On Mon, Nov 9, 2009 at 4:44 PM, Grzes <gregorio99 at gmail.com> wrote:
>
> Hi !
> I have a vector:
> vec= TRUE  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE TRUE  TRUE  FALSE
> and I'm looking for a method which let me get only the first values equal
> TRUE from this vector. It means that I want to get a vector:
> vec_out =  TRUE  TRUE  TRUE  TRUE
>
> or posictions values = TRUE: vec_out = 1,2,3,4
> --
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>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O