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Take a value like "a + b" and (1) replace it with NA if na_col == NA. (2) Change to "(a + b)" if there is a "+" (3) Return itself otherwise, e.g., "a" --> "a".
format_code(col, na_col)
string
A column
If this column is NA, return NA
Jonas Kristoffer Lindeløv jonas@lindeloev.dk