[gmx-users] mdrun rerun no forces

[Sebastian]

Hi,

I try to use the mdrun -rerun option to obtain the internal protein 
forces on each atom.
First I used

tpbconv  -s old.tpr -o new.tpr -f old.trr -n index.ndx -time -1

to obtain the protein only .tpr file which I want to use for the rerun.
In the next step I perform the rerun using:

mdrun -s new.tpr -o new.trr -rerun old.xtc

When I use now

trjconv  -f new.trr -o new.gro -s new.tpr -force

to check if there are any forces I find only 0.0000 forces.

What I am doing wrong here?

Best,

Basti