Since force matching uses the atom trajectory to compute tabulated forces, I am wondering if csg_fmatch can be used to get a list of forces derived from the all-atom trajectory but mapped to the coarse-grained particles. I tried using the --traj-force option for fmatch but it gave an io error. The description of the --trj-force flag (coarse-grained trajectory containing forces of already known interactions) is not very clear to me. The manual does not talk about it in detail either. Initially I tried mapping the all-atom traj to cg traj using csg_map. But when I am using gmx traj to extract the forces, the file lists 6000 (fine grain) atom indices instead of 2000 (coarse grain).
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