Data.frames in R: name autocompletion?

Question

Sorry if this is trivial. I am seeing the following behaviour in R:

> myDF <- data.frame(Score=5, scoreScaled=1)
> myDF$score ## forgot that the Sco         


        

Answer 1

The $ operator needs only the first unique part of a data frame name to index it. So for example:

> d <- data.frame(score=1, scotch=2)
> d$sco
NULL
> d$scor
[1] 1

A way of avoiding this behavior is to use the [[]] operator, which will behave like so:

> d <- data.frame(score=1, scotch=2)
> d[['scor']]
NULL
> d[['score']]
[1] 1

I hope that was helpful.

Cheers!