Try this:

x <- sample(0:1, rep = TRUE, 1e6, prob=c(0.4, 0.6))
sample(which(x == 1), 1)

On Mon, Apr 28, 2008 at 1:12 PM, <osmirnov@notes.cc.sunysb.edu> wrote:

>
> I have a vector consisting of zeroes and ones, e.g. 101001.
>
> I would like to pick a random element from this vector equal to one. In
> the
> example above, that means that only elements 1, 3, or 6 can be chosen.
>
> Is there a simple and fast way to do that? (my vector of zeroes and ones
> is
> very large)
>
> Thank you.
>
> ---------------------------------------------------------
> Oleg Smirnov
> Assistant Professor of Political Science
> Stony Brook University
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>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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