[support] Computed fields module(Auto calculation for existing node fields)

Hellos, I am using the computed fields module to do some calculations for some node fields. It is working fine The issue is that the fields being computed came before, I installed the computed filed module. What is happening is I ahve to edit and save the node for the computtions to take place. I there a work around since the nodes are too many, for me to edit one by one. Thanks