Beware: 2 is not always 2 in R

May 14, 2013
By

(This article was first published on Are you cereal? » R, and kindly contributed to R-bloggers)

This post is minimalistic.
Consider this:

x <- 2.0000001

Now let’s have look at what’s inside x:

x
> [1] 2

But is it really true?

x==2
> [1] FALSE

Here you go.
A colleague of mine was once ruined by this for an entire day before we realized what was going on.
So, how to find out what REALLY is the value of x?
Try:

as.character(x)
> [1] "2.0000001"

To leave a comment for the author, please follow the link and comment on their blog: Are you cereal? » 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...

Comments are closed.

Sponsors

Mango solutions



RStudio homepage



Zero Inflated Models and Generalized Linear Mixed Models with R

Quantide: statistical consulting and training

datasociety

http://www.eoda.de





ODSC

ODSC

CRC R books series





Six Sigma Online Training









Contact us if you wish to help support R-bloggers, and place your banner here.

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)