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Hi,<br>
<br>
Well first of all rtfm on Gambit's random number generation, there's a
nice API in there for it.<br>
<br>
But... I have personally had problems with it _apparently_ generating
very non-random output under Win32, but working fine under OS-X. It
seems to loop over a fixed output sequence. I spent a day trying to
isolate the failure conditions, but couldn't; simple test apps seem to
work fine and pass standard randomness tests ok but my app gets the
patterns. Short of it is if I drop in another RNG - even good ol' C
rand() - I don't get any problems. (This is Gambit 4.4.2 visual C
build btw)<br>
<br>
Haven't filed a bug report because I still don't know if it's a Gambit
bug or my bug. :(<br>
<br>
Anyway, here's a version of Mersenne Twister I hacked in in a great
hurry, it solved my problems at the time. If anyone - esp mathematical
types - spot any glaring numerical badness, feel free to send me a fix
:-)<br>
<br>
Cheers<br>
Darren<br>
<br>
<br>
lowly coder wrote:
<blockquote
cite="mid:858d2cda0904192330l25ca8024k1714527d55c83b21@mail.gmail.com"
type="cite">Hi!<br>
<br>
I'm doing some work that involves MCMC / gibbs sampling ... and I
need lots of random numbers, fast! I would also like it to be
deterministic (after I give it a seed) so debugging / results is
replicable. The best I have in mind right now ... is to seed something,
impelment rc4, and go with that. Anyone have a better suggestion /
something alread implemented in gambit?<br>
<br>
Thanks!<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Darren Baker
CEO, CTO
Wildfire Studios Pty. Ltd.
</pre>
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