n: The number of observations in the current group.

Description Usage Examples

Description

This function is implemented specifically 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)
}

Example output

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Loading required package: nycflights13
Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called 'nycflights13'

dplyr documentation built on July 4, 2019, 5:08 p.m.