[NAMD] Define time-dependent grid force

From: The Cromicus Productions (thecromicusproductions_at_gmail.com)
Date: Fri Jul 20 2018 - 12:52:13 CDT

Hi everyone,

I'm playing with some grids (
http://www.ks.uiuc.edu/Research/namd/2.9/ug/node43.html) and I'd like to
have a time-dependent gridforcescale to make the field be sinusoidal. That
is, I'd like
the gridforcescale to be someting like [expr cos(2*t)].
My question is the following: how can I refer to the instantaneous
simulation time in the NAMD input file?

Thanks a lot,

Sebastian

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