[R] counts of a vector

[Gabor Grothendieck]

Check out this thread for numerous solutions:
https://stat.ethz.ch/pipermail/r-help/2007-June/134557.html

On Wed, May 26, 2010 at 1:22 PM, speretti <sabrina.peretti at gmail.com> wrote:
>
> Hi,
>
> I need help to find an efficient way to transform a vector like:
>
> a<-c(1,1,0,1,0,0,0,1,1,1,1,0,1,0,1,1)
>
> in a vector that counts only di 1 elements, like:
>
> b<-c(1,2,0,1,0,0,0,1,2,3,4,0,1,0,1,2)
>
>
> Thank you!
> --
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