sorry, I was extremely busy in the last couple of weeks.nanswer to point 3, yes it saves the original position of the nodes. you will need to run the on_demand one time only before starting simulation.nAnd the error is here NODE_Y(node_p) = y + N_UDMI(f,tf,0) ;nnmake it NODE_Y(node_p) = y + N_UDMI(node_p, 0);n