n: Compute the number of ranges in each group.

In sa-lee/plyranges: A fluent interface for manipulating GenomicRanges

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)

sa-lee/plyranges documentation built on April 15, 2024, 12:25 p.m.