[lammps-users] group/group command

Dear lammps users

I have a system of rigid large particles in solution where the interaction is given via LJ + Coulomb contributions. Now I want to calculate for each time step the force on the colloids com exerted by the solution only (not the total force coming from all particles in the system). Can I do this using the group/group command?

Thank you for your advise.

Regards

Sabine