n {dplyr} | R Documentation

## The number of observations in the current group.

### 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)
    }

[Package dplyr version 0.7.0 Index]