[R] rbinom for a matrix

Ben Bolker bolker at ufl.edu
Wed Jul 9 21:13:52 CEST 2008

ACroske <Audy3272 <at> yahoo.com> writes:

> I have a large matrix full of probabilities; I would like to convert each
> probability to a 1 or a 0 using rbinom.
> How can I do this on the entire matrix? The matrix was converted from a
> raster ArcMap dataset, so the matrix is essentially a map. Because of this,
> I have no column headings.
> Thanks! 

  How about


  or (perhaps marginally more efficiently?)

y <- (runif(m)<m)
storage.mode(y) <- "double"

  Ben Bolker

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