Dear R-helpers:
Suppose I have a datafram called "test_frame" like this
col1 col2 col3 col4
r1 x x x x
r2 x x x x
r3 x x x x
.. x x x x
rn x x x x
I know I can get data of col3 by using test_frame[,3].
My question is, if I want to do this by specifying "col3" rather than 3,
what should I do?
Many thanks....
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