change force field in NAMD

From: Chen, Zhihong (chenz2) (
Date: Mon Oct 04 2010 - 14:11:11 CDT

I need to calculate some specified energy which namd doesn't have, do i would need to change the force field fundenmantally or add some subroute to calculate the energy i want. Would u tell me can i do that in namd and how to do it?
thanks cheers

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