Читать книгу The Big R-Book - Philippe J. S. De Brouwer - Страница 105

Use “short-cuts” sparingly and only when working interactively (not in functions or code that will be saved and re-run later). When later another column is added the short-cut will no longer be unique and behaviour is hard to predict and it is even harder to spot the programming error in a part of your code that previously worked fine.