R help - Apr 2008 - choosing a random element from a vector

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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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
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


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

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