[R] Stumped with subsetting

Sundar Dorai-Raj sundar.dorai-raj at PDF.COM
Thu Jul 29 21:36:22 CEST 2004

Peter Wilkinson wrote:

> This seems like such a trivial thing to do:
> given a data.frame DF and variables w,v, x,y,z I can do
> DF["x"] or DF[c("x","y")]
> if I create a vector, mylist = c("x",y")
> then I do DF[mylist]
> I am not getting x and y, I get something else.
> what is the correct way to subset a data.frame by columns using a 
> vector, as if I were doing DF["x","y"]?
> Peter
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> http://www.R-project.org/posting-guide.html

You want DF[, mylist]. DF[mylist] returns a list. You may want to look 
at "An Introduction to R", which covers this topic.


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