assign number every time an event occurs in r -


i have data:

t <- c(na,na,na,1,na,na,na,na,1,na,1) dt <- data.table(t)       t  1: na  2: na  3: na  4:  1  5: na  6: na  7: na  8: na  9:  1 10: na 11:  1

is possible create new column z , assign number in ascending order every time 1 occurs in t column, this:

     t  z  1: na na  2: na na  3: na na  4:  1  1  5: na na  6: na na  7: na na  8: na na  9:  1  2 10: na na 11:  1  3

thank you

we can create logical index of non-na elements in 'i' , assign ('z') sequence of 't'

dt[!is.na(t), z := seq_along(t)] dt #     t  z # 1: na na # 2: na na # 3: na na # 4:  1  1 # 5: na na # 6: na na # 7: na na # 8: na na # 9:  1  2 #10: na na #11:  1  3

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