How can we measure acting force on a group of atom in LAMMPS?

Dear all
Good day.
I have a mono layer panel of atom for uniaxial tension simulation in
LAMMPS. For stress-strain curve I normally plot the pressure in the applied
strain direction with respect to strain.
Now, I want to plot force-displacement curve. In normal sense, we can
compute the force by multiply panel area with pressure (stress).

My question is there any other way to *measure the force between two group
of atoms *in LAMMPS (one is my panel and another is holder section for
uniaxial test).
Thank you in advance.

Thank you very much.

Best Regards
*Md Imrul Reza Shishir*
PhD Student
*UNC Charlotte*
United States

the total force acting on a group of atoms is the sum of the forces on
all atoms in the group. for that you can use compute reduce.
the total force specifically between to groups of atoms can in some
simple cases, be difference of the total forces from above. for other
cases, there is compute group/group.