(1) How do I get a certain data frame column by name? I.e., what's
the equiv. to: mtcars$mpg? In RPy2, mtcars['mpg'] doesn't work.
(2) How do I specify the equivalent of qplot(x, data=df)? qplot('x',
data=df) doesn't work. Is the only way to use qplot(df[index])?
Thanks in advance.
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