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df = data_frame(a = 1, b = 2)
varlist1 = c("c")
varlist2 = c("a", "c")
The first selection returns the whole data frame, but I expect seeing an error or message indicating that there's no variable called c.
The second selection returns an error:
Error: Each argument must yield either positive or negative integers
This error message is not quite clear to me. It would be great if the second selection yields column a with a warning saying that c can not be found.
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