Re: Lua For PalmOS Alpha2 released
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- Subject: Re: Lua For PalmOS Alpha2 released
- From: "Adam D. Moss" <adam@...>
- Date: 2004年7月12日 09:31:34 +0100
Philippe Lhoste wrote:
Bad Things:
- PalmOS MathLib does not have a rand() or srand() function. If
you have
one, MIT licesend, please send to us, so we can add it to the port.
I believe the Meresnne Twister
<http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html> was
implemented in Lua or in C with Lua interface. Maybe this is an overkill
for the PalmOS (I don't know if the implementation is really big or slow
or memory hungry. They say it is as fast as rand(), and consumes 624
words of workplace, probably because it generates 624 numbers at each
iteration)
I may as well pimp my random number generator again, since
it's probably good for low-power CPUs, though it doesn't come
with a lua binding (yet!) but that should be simple:
http://icculus.org/~aspirin/fnvrand/
It uses only a few bytes of state and is about 10x faster than
a good MT implementation, though I really doubt the quality of
randomness is comparable (but it's pretty good, from casual
analysis).
--Adam