See [this repository](https://github.com/jennybc/row-oriented-workflows) for alternative ways to perform row-wise operations.
Input data frame.
'rowwise()' is used for the results of [do()] when you create list-variables. It is also useful to support arbitrary complex operations that need to be applied to each row.
Currently, rowwise grouping only works with data frames. Its
main impact is to allow you to work with list-variables in
[summarise()] and [mutate()] without having to
[]. This makes 'summarise()' on a rowwise tbl
effectively equivalent to [plyr::ldply()].
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