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[ILUG] random number generation

[ILUG] random number generation

paul at clubi.ie paul at clubi.ie
Wed Jun 21 13:50:04 IST 2006


On Wed, 21 Jun 2006, JMcCarthy at mortgagelink.ie wrote:

> Anything lager simply do that again & multiply the first pile by the
> second, or have the second pile as the power of the first.

I'm no mathematician, but I don't see how either operation gives you 
a random number. Both operations are commutative and hence must lose 
at least one bit of entropy, and neither operation fully maps to the 
range of numbers (the latter function mapping quite sparsely) in the 
order of your 'random number'.

Just use each pile (or successive 'throws' of the same pile) as a 
digits of increasing significance until you have a random number of 
the desired order.

regards,
-- 
Paul Jakma	paul at clubi.ie	paul at jakma.org	Key ID: 64A2FF6A
Fortune:
Our policy is, when in doubt, do the right thing.
 		-- Roy L. Ash, ex-president, Litton Industries



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