README.md

In mkearney/funique: A Faster Unique Function

funique

⌚️ A faster unique() function

Installation

You can install the released version of funique from Github with:

## install remotes pkg if not already
if (!requireNamespace("remotes", quietly = TRUE)) {
  install.packages("remotes")
}

## install funique from github
remotes::install_github("mkearney/funique")

Usage

There’s one function funique(), which is the same as base::unique() only optimized to be faster when data contain date-time variables.

Speed test: funique() vs. base::unique()

The code below creates a data frame with several duplicate rows and then compares performance (in time) of funique() versus base::unique().

## set seed
set.seed(20180812)

## generate data
d <- data.frame(
  x = rnorm(1000),
  y = seq.POSIXt(as.POSIXct("2018-01-01"),
    as.POSIXct("2018-12-31"), length.out = 10))

## create data frame with duplicate rows
d <- d[c(1:1000, sample(1:1000, 500, replace = TRUE)), ]
row.names(d) <- NULL

## check the output against base::unique
identical(unique(d), funique(d))

## bench mark
(m <- microbenchmark::microbenchmark(unique(d), funique(d), 
  times = 200, unit = "relative"))

## plot
plot(drop_hl(m, n = 4)) + 
  ggplot2::ggsave("man/figures/r1.png", width = 8, height = 4.5, units = "in")

Here’s another test this time using duplicate-infested Twitter data. wzxhzdk:2

mkearney/funique documentation built on May 25, 2019, 5:01 a.m.