simulating sputter deposition

In this post, she has fixed set force to 0 for the group ‘fixed’
http://lammps.sandia.gov/threads/msg34474.html

Isn’t it wrong to apply the fix nve to group ‘all’ as you mentioned? Shouldn’t this group be ignored?

Thanks.

In this post, she has fixed set force to 0 for the group 'fixed'
http://lammps.sandia.gov/threads/msg34474.html

Isn't it wrong to apply the fix nve to group 'all' as you mentioned?
Shouldn't this group be ignored?

both methods, excluding atoms from time integration and setting
velocity and force to zero, are valid methods to immobilize atoms.

axel.