Sundar Dorai-Raj wrote:
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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You want DF[, mylist]. DF[mylist] returns a list. You may want to look at "An Introduction to R", which covers this topic.
Sorry, typed too quickly.
DF[mylist] and DF[, mylist] are the same if mylist is a vector with more than one element.
After re-reading your post, I'm not quite sure what you are expecting. Sorry for any confusion....
--sundar
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