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Re: Undocumented change to Mersenne Twister breaks repeatability
- To: Jamie Lokier <jamie dot lokier at cern dot ch>
- Subject: Re: Undocumented change to Mersenne Twister breaks repeatability
- From: Brian Gough <bjg at network-theory dot co dot uk>
- Date: Fri, 31 Aug 2001 19:32:37 +0100 (BST)
- Cc: gsl-discuss at sources dot redhat dot com
- References: <20010831164347.A25312@thefinal.cern.ch>
Jamie Lokier writes:
> I noticed that between gsl-0.6 and gsl-0.7, the mt19937 generator was
> changed to calculate the seed state differently and hence yield a
> different random sequence from the same seed. Furthermore, the change
> isn't documented, either in NEWS, the ChangeLogs, or in the
> documentation.
Not sure why you don't have them but there are entries for the updated
seeding procedure in the NEWS file and rng/ChangeLog of gsl-0.7, and
later versions.
> I would have expected a new mt19937 generator to have a new name. It's
> too late now, but could the old generator be reinstated under a
> different name, perhaps mt19937_1998?
I've made the old generator available in the current CVS version as
requested.
regards
Brian Gough