From: David A. Case <>
Date: Fri, 16 Jan 2004 08:09:27 -0800

On Fri, Jan 16, 2004, L Jin wrote:
> I am trying to run MD with ntf=6 to constrain some interactions within the
> molecule.

ntf has nothing to do with constraints; it just removes some pieces of the
potential. Anything greater than ntc=3 would generally only be used for
debugging, and then only for single-point energies, not for dynamics or

If you want to add constraints, look at section FOUR in the sander section
of the Amber manual.

...good luck...dac

David A. Case                     |  e-mail:
Dept. of Molecular Biology, TPC15 |  fax:          +1-858-784-8896
The Scripps Research Institute    |  phone:        +1-858-784-9768
10550 N. Torrey Pines Rd.         |  home page:                   
La Jolla CA 92037  USA            |
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Received on Sun Jan 18 2004 - 19:53:05 PST
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