r - finding duplicate rows counts by keeping all rows -


this question has answer here:

i have data frame df1

df1:       c 1:  1  6 2:  2  8 3:  3  1 4: 45  3 5:  2  8

i need find duplicate count of rows keeping duplicate rows.the result should like:

     c count 1:  1  6   1 2:  2  8   2 3:  3  1   1 4: 45  3   1   5:  2  8   2

as rows 2 , 5 duplicates.but able solution give answer 

     c count 1:  1  6   1 2:  2  8   2 3:  3  1   1 4: 45  3   1

by doing 

 df1<-data.table(df1)      df1[, .n, = list(a,c)]

how desired result?

you may in base r:

df1$count <- with(df1, ave(a, list(a, c), fun = length))  df1 #     c count # 1:  1 6     1 # 2:  2 8     2 # 3:  3 1     1 # 4: 45 3     1 # 5:  2 8     2

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