AW: MSM grid values

From: Norman Geist (
Date: Fri Feb 08 2019 - 03:04:28 CST

Sry, wrong replied to wrong mail


Von: [] Im Auftrag von Norman Geist
Gesendet: Freitag, 8. Februar 2019 10:00
An:; 'Denish Poudyal' <>
Betreff: AW: namd-l: MSM grid values


Just my cents, I’m using a 4fs timestep without any problems (even REMD) by applying the hydrogen mass repartitioning scheme. As I’m using the amber forcefield, this modification can simnply be applied on the parm7 topology file using ParmED.



Von: <> [] Im Auftrag von Denish Poudyal
Gesendet: Freitag, 8. Februar 2019 02:46
An: David Hardy < <> >
Cc: NAMD list < <> >
Betreff: Re: namd-l: MSM grid values


Yes, the grid spacing remains 2.5 A, however for the MSMminx/MSMmaxx and corresponding values along y and z can vary. And in many cases, I got the error saying some atoms are out of the grid and I have been trying to adjust the MSMmin/max values. Worst thing is this error pops out after few hours of simulation.


On Fri, Feb 8, 2019 at 2:28 AM David Hardy < <> > wrote:

Generally, the grid spacing should be on the order of 2 to 3 Angstroms for a 12 A cutoff.


NAMD will make good choices for MSM by default, assuming you are simulating atoms.


David J. Hardy, Ph.D.
Beckman Institute
University of Illinois at Urbana-Champaign
405 N. Mathews Ave., Urbana, IL 61801 <> ,
On Feb 6, 2019, at 11:15 PM, Denish Poudyal < <> > wrote:
How do we assign the MSMx/y/z values in a simulation?
Denish Poudyal
CDPTU, Nepal
Denish Poudyal
CDPTU, Nepal

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