How to restraint angle in NAMD

From: George Khelashvili (gek2009_at_med.cornell.edu)
Date: Fri Oct 01 2010 - 21:32:29 CDT

  Dear users,

I am trying to set up simulation with NAMD in which I restrain/constrain
angle between a vector connecting certain two atoms in the system and
the simulation box z axis. I assume that this can be done with a tcl
force script. I would appreciate if somebody can provide one or suggest
how to write such script.

Thank you,
George

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