#1

Hi,
I want to group_by dataframe and select top n values for each group. But I want n differ for each group.
I write following code:
dt = d %>% group_by(USER_ID)%>% slice_head(n = min(top))
but it does not work. Is any idea how to solve it?

#2

I find out solution:

  1. group data by ID and arrange. then create new variable - "rownumber":
    d %<>% group_by(USER_ID)%>% mutate( rownumber = row_number())
  2. filter where rownumber <= top
    d %<>% filter(rownumber<=top)
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#3

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