Dear Amber Users:
I'm now doing MD in vacuum using Amber7 on my protein which contains
about 20,000 atoms. I first equilibrate it in a stage of 0K to 300K for
100ps. Then, I want to do second equilibration for another 100ps. I want
to let Sander read X and V informatin via ntx=7. But I got error
messages as follows:
-----------
Ewald PARAMETER RANGE CHECKING:
parameter alpha: (unit cell angle) has value -0.97091E+00
This is outside the legal range
Lower limit: 0.30000E+02 Upper limit: 0.15000E+03
Check ew_legal.h
-----------
While use ntx=5 is OK.
I searched in the archive. ntx=7 will read X, V as well as Box whereas
ntx=5 don't read Box. So it's obvious that the Box information read in
by sander from rst file is beyond 30A. But how could this happen? I
checked the trajectory, it looks fine and no strange things could be
found. Any helps? Thanks in advance!
Best Regards!
Liu
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Received on Wed Jun 23 2004 - 14:53:00 PDT
