Count of Comma separate values in r -


i have column named subcat_id in values stored comma seperated lists. need count number of values , store counts in new column . lists have null values want arid of.

example

i store counts in n column.

we can try

 nchar(gsub('[^,]+', '', gsub(',(?=,)|(^,|,$)', '',        gsub('(null){1,}', '', df1$subcat_id), perl=true)))+1l  #[1] 6 4

or

library(stringr) str_count(df1$subcat_id, '[0-9.]+') #[1] 6 4

data

 df1 <- data.frame(subcat_id = c('1,2,3,15,16,78',          '1,2,3,15,null,null'), stringsasfactors=false)

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