n: The number of observations in the current group.

In YTLogos/dplyr: A Grammar of Data Manipulation

Description

This function is implemented specifically 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)
}

YTLogos/dplyr documentation built on May 20, 2019, 1:44 p.m.