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

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n()

Examples

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if (require("nycflights13")) {
carriers <- group_by(flights, carrier)
summarise(carriers, n())
mutate(carriers, n = n())
filter(carriers, n() < 100)
}

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