How to Reverse Data in R

Channel:

DataDaft

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53,300

Published on December 3, 2019 5:08:25 PM ● Video Link: https://www.youtube.com/watch?v=TqFG0TpZVSg

Category:

Guide

Duration: 2:50

4,972 views

38

This video shows how to reverse vectors, strings and data frames by both columns and rows in R.

Code used in this clip:

# Reverse a vector

v ＜- c("Reverse", "Me")

rev(v)

# Reverse a character string with stringi

library(stringi)
stri_reverse("Reverse Me")

# Reverse the columns of a data frame

data ＜- mtcars

head(data)

reversed_columns ＜- data[, rev(names(data))]
head(reversed_columns)

# Reverse the rows of a data frame

tail(data)

reversed_rows ＜- data[rev(1:nrow(data)), ]
head(reversed_rows)



Code Clips are basic code explanations in 3 minutes or less. They are intended to be short reference guides that provide quick breakdowns and copy/paste access to code needed to accomplish common data science tasks. Think Stack Overflow with a video explanation.


* Note: YouTube does not allow greater than or less than symbols in the text description, so the code above will not be exactly the same as the code shown in the video! For R that means I may use = for assignment and the special Unicode large ＜ and ＞ symbols in place of the standard sized ones for dplyr pipes and comparisons. These special symbols should work as expected for R code on Windows, but may need to be replaced with standard greater than and less than symbols for other operating systems.