On 29/08/2012 4:22 PM, Albert wrote:
Dear:
  I am trying to extract one frame of my simulation results by commands:

trjconv -f md.trr -s tuned.tpr -o md.xtc -pbc mol -timestep 100 -n out.ndx trjconv -f md.xtc -s tuned.tpr -fit rot+trans -o out.pdb -dump 133000.000 -n out.ndx

However, it said:

Fatal error:
Index[31715] 31716 is larger than the number of atoms in the
trajectory file (31715). There is a mismatch in the contents
of your -f, -s and/or -n files.
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors

Does anybody has any advices?

The error means exactly what it says. You need to think about what's in those files and why a mismatch is occurring, e.g. you used xtc output groups smaller than System.

Mark
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