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This function is implemented specifically for each data source and can only
be used from within summarise()
, mutate()
and
filter()
.
n()
# NOT RUN {
if (require("nycflights13")) {
carriers <- group_by(flights, carrier)
summarise(carriers, n())
mutate(carriers, n = n())
filter(carriers, n() < 100)
}
# }
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