[Haskell-cafe] Monte Carlo Pi calculation (newbie learnings)

Yitzchak Gale gale at sefer.org
Tue Nov 6 18:56:54 EST 2007

I wrote:
>> There is still a problem here - my code (and also
>> all of the previous posters, I think) clobbers the random
>> generator, rendering it unusable for future calculations.
>> In this case that is probably not a problem, but it
>> is a bad habit to get into, and not very polite.

Jonathan Cast wrote:
> Nope.  newStdGen is specified in terms of split, which means it
> leaves the random generator in a state independent of the generator
> it returns.  Perfectly safe.  (I think you think you used getStdGen).

I was referring to randoms and randomRs.
They clobber the generator. You can then get
a new one using newStdGen, but that forces
you back into the IO monad.


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