On Mon, Jun 13, 2011 at 4:56 PM, michael rice <nowgate@yahoo.com> wrote:
Is there an (existing) way to select 5 Ints randomly (no duplicates) from a population, say 1-20 (inclusive)?

Michael

This is as close as I have gotten, but it is only probabilistically true.

take_n_unique_randoms_in_range :: ( Ord random
                                  , Random random
                                  , MonadIO io
                                  ) => Int -> (random, random) -> io [random]
take_n_unique_randoms_in_range n (a,b) = liftM ((take n) . nub) . (replicateM (3*n)) . liftIO $ randomRIO (a,b) 

I'm going to put making an iteratee-based solution on my agenda.