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This repository was archived by the owner on Jun 5, 2020. It is now read-only.
Rowwise vectorisation in dplyr is a consequence of normal R rules for vectorisation. A vectorised function is a function that works the same way with vectors of 1 element as with vectors of _n_ elements. The operation is applied elementwise (often at the machine code level, which makes them very efficient). We have already mentioned the vectorisation of `toupper()`, and many other functions in R are vectorised. One important class of vectorised functions is the arithmetic operators:
you say:
We have already mentioned the vectorisation of toupper(), and many other functions in R are vectorised.
But I have not found this mention. At least, not in this book :)