Dear All: I have a dataset like A=c(0,12,34,5,6,0,4,5,6,0,12,3,4,8,7,0,4,3,5,0,.......),I want to add a column to this dataset, it must be in B=c(1,1,1,1,1,2,2,2,2,3,3,3,3,3,3,4,4,4,4,5,......), How can I create B based on the sequence of A. Appreciate. Zheng