Immediate Evaluation of Variables

hey,
is it possible to do the immediate evaluation of variables for an atom-vector? For a scalar its simply
variable v equal vol
variable v0 equal $v
But for atom vectors it is not possible to use $
variable x atom x
variable x0 atom $x
this would fail.
Is there a way to safe the initial state of an atom vector and use it in further atom vector calculations?

kind regards
Joshua