n {plyranges} | R Documentation

## Compute the number of ranges in each group.

### Description

This function should only be used within `summarise()`, `mutate()` and `filter()`.

### Usage

    n()

### Value

`n()` will only be evaluated inside a function call, where it returns an integer.

### Examples

    ir <- as_iranges(
                     data.frame(start = 1:10,
                                width = 5,
                                name = c(rep("a", 5), rep("b", 3), rep("c", 2))
                                )
                    )
    by_names <- group_by(ir, name)
    summarise(by_names, n = n())
    mutate(by_names, n = n())
    filter(by_names, n() >= 3)

[Package plyranges version 1.4.4 Index]