Reassembling logical operations on boolean vectors in Gnu R

October 13, 2010
By

(This article was first published on binfalse » R, and kindly contributed to R-bloggers)

What a headline.. It’s about combining boolean vectors in R.

I just had some problems with computing a boolean vector as a result of applying AND to two boolean vectors:

1
2
3
4
> x <- c(FALSE, TRUE, FALSE)
> y <- c(TRUE, TRUE, FALSE)
> x&&y
[1] FALSE

As you can see, it’s a nice result, but not what I want.. My hack was the following:

1
2
3
4
5
6
> # logical AND
> as.logical(x*y)
[1] FALSE  TRUE FALSE
> # logical OR
> as.logical(x+y)
[1]  TRUE  TRUE FALSE

When Rumpel, my personal R-freak, saw that hack, he just laughed and told me the short version of this hack:

1
2
3
4
5
6
> # logical AND
> x&y
[1] FALSE  TRUE FALSE
> # logical OR
> x|y
[1]  TRUE  TRUE FALSE

Nice, isn’t it 😉

To leave a comment for the author, please follow the link and comment on their blog: binfalse » R.

R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: Data science, Big Data, R jobs, visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...



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

Tags: , , , , , ,

Comments are closed.

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)