[R] Stumped with subsetting
sundar.dorai-raj at PDF.COM
Thu Jul 29 21:46:18 CEST 2004
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"]?
>> R-help at stat.math.ethz.ch mailing list
>> PLEASE do read the posting guide!
> 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....
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