Re: [Haskell-cafe] random question

Excerpts from Bryan O'Sullivan's message of Wed Oct 07 23:25:10 +0200 2009:

On Wed, Oct 7, 2009 at 1:59 PM, Michael Mossey wrote:

...

My thread about randomness got hijacked so I need to restate my remaining question here. Is it acceptable to write pure routines that use but do not return generators, and then call several of them from an IO monad with a generator obtained by several calls to newStdGen?

shuffle :: RandomGen g => g -> [a] -> [a] shuffle = ...

foo :: [a] -> [a] -> IO () foo xs ys = do g1 <- newStdGen print $ shuffle g1 xs g2 <- newStdGen print $ shuffle g2 ys

Does this kind of thing exhibit good pseudorandomness?

If you believe in the safety of the split operation (which I don't), then ^^^^^^^^^^^^^^^^ | Can you elaborate on that? ---------------------------------+

Best regards, -- Nicolas Pouillard http://nicolaspouillard.fr