Justin A. Lemkul wrote:


Dayle Smith wrote:
Thanks for your help, Justin. I ran gmxcheck -c topol.tpr ("12284 atoms in file") and gmxcheck -f traj.xtc ("# Atoms 29"). The difference is

Indeed, that's the problem, then!

the SOL atoms. I made another .tpr file with xtcgroups = TDR SOL, and now gmxcheck shows that the number of atoms in topol.tpr is 12284, but I still can't get g_covar to work. Maybe these are unrelated problems, I'm not sure.

You haven't really changed anything. The xtc-grps parameter defines what was saved in the simulation. Setting it after the fact does not affect the already-produced .xtc file. What you need is a .tpr file that contains only TDR, so you would have to make modifications to your .top in order to generate this TDR-only .tpr file.

Or use tpbconv - this is the "other" application for that utility.

Mark
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