[Haskell-cafe] Mutable data within a (non-IO) monad

Bryan O'Sullivan bos at serpentine.com
Mon Oct 5 17:55:47 EDT 2009

On Sat, Oct 3, 2009 at 1:57 AM, Duncan Coutts
<duncan.coutts at googlemail.com>wrote:

> Internally, each time you demand the next random number, it is mutating
> the internal ST array.

This is the same thing that the Statistics.RandomVariate code in the
statistics package does, and it can be very fast:
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