Maik Goette wrote:
Hi
I just observed very strange results with my system (around 700 atoms in
vacuum), when doing normal mode analysis. The eigenvalues were all
negative.
I then took an old nma-system from Bert de Groot and did the nma with
3.3.1 on it and observed the same strange results. After that I tried
3.2.1 on that system and the results were quite similar to the ones Bert
got with 3.1.4.
My vacuum-system yields (more or less) correct (not nice) results on the
first look.
Is there something new to obey in 3.3.1 what isn't mentioned in the
manual (3.11 NMA)?
If not, I would think, there's a bug.
Any suggestions?
Regards
Are you using cut-offs? In that case gromacs uses a different algorithm
now, which might cause the problem. Anyway if you have a reproducible
problem please report a bugzilla and upload the necessary files.
--
David.
________________________________________________________________________
David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596, 75124 Uppsala, Sweden
phone: 46 18 471 4205 fax: 46 18 511 755
[EMAIL PROTECTED] [EMAIL PROTECTED] http://folding.bmc.uu.se
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