[gmx-users] negative values of force

Samrat Pal psamrat10 at yahoo.com
Sat Aug 14 19:30:52 CEST 2010

Dear All,
              I have pulled a protein by keeping n-terminus fixed and pulling 
the c-terminus. I tried to extract the force.xvg profile from the .trr file by 
the following command -

g_traj -f traj.trr -s pull.tpr -of force.xvg

But in the force.xvg profile I am getting both positive and negative values of 
force. What does it mean? Please suggest.

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