Dear Lammps users:
I'd like to calculate velocity auto correlation function by using the command "compute vacf", but the value always fluctuated around 0 not from 1 to 0.
The command I used is "compute 1 all vacf
fix 1 all ave/time 1 1 1 c_1 mode vector file vacf.profile"
Is there any errors in my command
I would appreciate any help.