r - maximum number of unique elements occurring for a given value in matrix -


suppose got data frame this:

> id = c(1,1,1,1,1,2,2,2,3,3) > type = c("a","a","b","c","a","a","b","c","a","c") > data = data.frame(id,type) > data    id type 1   1    2   1    3   1    b 4   1    c 5   1    6   2    7   2    b 8   2    c 9   3    10  3    c

i find out maximum number of unique types per id, not maximum among values. there 1 liner in base package this? thank you.

you can try

 library(data.table)#v1.9.5+  setdt(data)[, list(type=uniquen(type)) ,id]

or

 library(dplyr)  data %>%     group_by(id) %>%     summarise(type= n_distinct(type))

or using base r

  aggregate(type~id, data, fun=function(x) length(unique(x)))

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