Dear LAMMPS Tech-Support,
I am trying to understand how LAMMPS works by going through some simple simulations. One of these is simulating a single particle in a box undergoing a random walk. My files are copied below. When I try simulating this, I get a thermodynamic output with no potential or kinetic energy (even though I specified a velocity for the atom AND I have placed it in a langevin fix! Can you tell me whether simulating one atom has some special feature that I need to concern myself with? When I add a second particle, it seems to work fine (in terms of energies at least anyway).