Last data update: 2014.03.03
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R: The number of observations in the current group.
The number of observations in the current group.
Description
This function is implemented special for each data source and can only
be used from within summarise , mutate and
filter
Usage
n()
Examples
if (require("nycflights13")) {
carriers <- group_by(flights, carrier)
summarise(carriers, n())
mutate(carriers, n = n())
filter(carriers, n() < 100)
}
Results
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