dataframe - Cumulative count of blocks of 1 with 0 separators in a binary vector in R -


i have data frame binary vector want cumulative count of. count 'groups of 1's' rather each individual 1 , create new vector of count while retaining 0 separating values. i.e. 

df1 <- data.frame(c(0,1,1,1,1,0,0,0,1,1,1,1,1,0,0,0,1,1,1)  n   bin 1    0 2    1 3    1 4    1 5    1 6    0 7    0 8    0 9    1 10   1 11   1 12   1 13   1 14   0 15   0 16   0 17   1 18   1 19   1

becomes

n   bin cumul 1    0     0 2    1     1 3    1     1 4    1     1 5    1     1 6    0     0 7    0     0 8    0     0 9    1     2 10   1     2 11   1     2 12   1     2 13   1     2 14   0     0 15   0     0 16   0     0 17   1     3 18   1     3 19   1     3

how go this?

you can use rleid function package data.table:

df1 <- data.frame(bin = c(0,1,1,1,1,0,0,0,1,1,1,1,1,0,0,0,1,1,1)) library(data.table) setdt(df1) df1[, cumul := rleid(bin)] df1[bin == 0, cumul := 0]                   df1[bin == 1, cumul := rleid(cumul)]   #    bin cumul # 1:   0     0 # 2:   1     1 # 3:   1     1 # 4:   1     1 # 5:   1     1 # 6:   0     0 # 7:   0     0 # 8:   0     0 # 9:   1     2 #10:   1     2 #11:   1     2 #12:   1     2 #13:   1     2 #14:   0     0 #15:   0     0 #16:   0     0 #17:   1     3 #18:   1     3 #19:   1     3

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