Restraining angle between bond vector and coordinate vector

From: Seth Axen (
Date: Mon Mar 23 2015 - 15:26:37 CDT

I would like to add a harmonic restraint for an angle between a specific
bond vector and a target vector in 3D space, defined by 3 coordinates. The
resulting force should be updated at every step of the simulation. I'm
having trouble figuring out the best way to go about this from the
documentation and user-defined forces examples, and I'd appreciate any


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