Of course it would change the results !
And that would not be the only thing in namd different than amber per-se.
Make absolutely sure that you are using the correct 1-4 scaling factors 
for electrostatic and vdw. The namd defaults are wrong.
Adrian
musa özboyacı wrote:
> Dear all,
> I am trying to simulate a system using NAMD with AMBER force field. I have
> just realized that, I had turned on switching function and defined a
> switching distance. Since, for AMBER does not use such switching functions,
> does this function change my results? and, should I simply give an end to my
> simulations and restart them? I am going to perform some energy calculations
> after these simulations so, does this function make my results unreliable?
> Any help is appreciated, thanks in advance!
> 
> Musa Ozboyaci
> Koc University
> Computational Sciences and Engineering
> 
-- 
                            Dr. Adrian E. Roitberg
                              Associate Professor
                             Quantum Theory Project
                            Department of Chemistry
                  Senior Editor. Journal of Physical Chemistry
                           American Chemical Society
University of Florida                         PHONE 352 392-6972
P.O. Box 118435                               FAX   352 392-8722
Gainesville, FL 32611-8435                    Email adrian.qtp.ufl.edu
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Received on Wed Dec 24 2008 - 01:21:53 PST