> I have performed simulations of a carbohydrate in water in a truncated
> octahedron box in NPT ensemble and noticed that, despite the fact that the
> program always displays a density of around 1 g/cm3, the box seems to be
> expanded when viewed in vmd for example.
Likely IWRAP=0 so imaging is not occuring. Search the archives (imaging,
iwrap) at
http://amber.ch.ic.ac.uk/archive/
for a more verbose answer, but likely simply the water is diffusing to
adjacent periodic cells.
You can try using ptraj to image
trajin mdcrd
trajout mdcrd.imaged
center mass origin :1
image origin center familiar
If IWRAP=1, then this is a more severe problem and more details will be
necessary to decipher.
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Received on Thu Jul 08 2004 - 18:53:00 PDT
