sort.data.frame

August 15, 2014
By

[This article was first published on Mark van der Loo, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.

I came accross this post on SO, where several solutions to sorting data.frames are presented. It must have been solved a million times, but here’s a solution I like to use. It benefits from the fact that sort is an S3 generic.

sort.data.frame <- function(x, decreasing=FALSE, by=1, ... ){
  f <- function(...) order(...,decreasing=decreasing)
  i <- do.call(f,x[by])
  x[i,,drop=FALSE]
}

It sorts on the first column by default, but you may use any vector of valid column indices. Here are some examples.

sort(iris, by="Sepal.Length")
sort(iris, by=c("Species","Sepal.Length"))
sort(iris, by=1:2)
sort(iris, by="Sepal.Length",decreasing=TRUE)

To leave a comment for the author, please follow the link and comment on their blog: Mark van der Loo.

R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here if you're looking to post or find an R/data-science job.
Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.



If you got this far, why not subscribe for updates from the site? Choose your flavor: e-mail, twitter, RSS, or facebook...

Comments are closed.

Search R-bloggers

Sponsors

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)