R: count the number of occurrences -

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this question has answer here:

i more familiar python need in r. have data frame this:

     id                                               apps    8400                              10,19,9,9,8,9,1,3,3,6   10915                           10,2,6,2,3,2,2,3,2,3,2,6   72331                    10,9,6,1,2,4,6,2,14,3,3,2,3,9,2

i want count number of occurrences of each app , return app occurrences in new column:

     id                                               apps        8400                              10,19,9,9,8,9,1,3,3,6       9   10915                           10,2,6,2,3,2,2,3,2,3,2,6       2   72331                    10,9,6,1,2,4,6,2,14,3,3,2,3,9,2       2

bests.

i added answer case, maybe helps else :).

let me answer question, maybe helps else too: 

mymode <-   function(x) { x <- strsplit(x,",") names(sort(-table(x)))[1] }

then apply it: 

 df$most <- lapply(as.character(test$apps),mymode)

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