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