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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.
rowwise(data)Input data frame.
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
use [[1]]. This makes summarise() on a rowwise tbl
effectively equivalent to plyr's ldply.
df <- expand.grid(x = 1:3, y = 3:1)
df %>% rowwise() %>% do(i = seq(.$x, .$y))
.Last.value %>% summarise(n = length(i))
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