Yes, include the harmonic restrain(s) directly into the topology. Then you may convert the info (distance(s), angle(s)) into the g_wham format (which I do not know but should be reasonably easy) or use another script to get your PMF or
make you own ... it is possible.

On Jul 18, 2011, at 9:37 AM, Guido Polles wrote:

Hi everybody,
 I noticed that GPU version of gromacs do not support the pull code,
hence i suppose g_wham cannot be used to extract a PMF. I would like
to just ask if somebody could suggest or give any hint about the way
to do umbrella sampling and extract a PMF without pull code, so that I
will have an idea before I start diving deeper into the issue, make
mistakes and potentially write useless code.
Thanks in advance for any advice.
Guido Polles
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