unique_by: Efficiently Extract Unique Elements from a Data Frame

In HenrikBengtsson/TopDomStudy: TopDom Study by Segal et al.

Description

Efficiently Extract Unique Elements from a Data Frame

Usage

unique_by(x, by = NA_integer_, ...)

Arguments

x	A base::data.frame
by	The column, as an integer or by name, to be used to split up x in chunks. If NA (default), then the first factor, string, or integer column will be used. If neither type exists, then the first column will be used.
...	Additional arguments passed to base::unique per chunk.

Details

unique_by(x) is typically more memory efficient than unique(x).

Value

A base::data.frame with duplicated rows drop.

Examples

iris1 <- unique(datasets::iris)
iris2 <- unique_by(datasets::iris, by = "Species")
stopifnot(identical(iris2, iris1))

HenrikBengtsson/TopDomStudy documentation built on May 14, 2021, 1:49 p.m.