Suppose I create a simple DataFrame with one column:
df = DataFrame(A = ["1234567890abc", "0987654321def"])
I would like to create a new column that contains only the last three
characters of A, but cannot figure out how to access indices of A. If it
were a simple string (i.e., A = "1234567890abc") then it would be simple
(A[11:13]). But df["A", 11:13] returns an error, as does df[["A"]][11:13].
What am I missing?
If I was going to do this in R the code would be:
df$B <- substr(df$A, 11, 13)
Any help in what is probably obvious to everyone but me would be greatly
appreciated.
