arrange is not supported

[LaurentSmeets]

Considering arrange() is part of dplyr and tidyr I would expected support for it. For example:

iris %>%
  group_by(Species) %>%
  summarise(mean_Sepal_Length = mean(Sepal.Length), .groups = "drop") %>%
  arrange(desc(mean_Sepal_Length))

now gives:

group_by: one grouping variable (Species)
summarise: now 3 rows and 2 columns, ungrouped

while I would expect something like

group_by: one grouping variable (Species)
summarise: now 3 rows and 2 columns, ungrouped
arrange: now arranged in descending order by one variable (mean_Sepal_Length)

I think that would be a nice addition, if it would fit within the logic of this package.

[elbersb]

I was always hesitant to add information about arrange because it seems so obvious what is happening, but I guess there is some value in it -- especially if your data is grouped and you possibly sort within groups inadvertently.

[hhhh5]

Would it make sense to print information about the number of rows with NAs among the columns used for sorting? A user might not be aware whether there are any missings in the data. dplyr::arange() puts them last so it printing the head of a data.frame doesn't reveal such instances.

[elbersb]

interesting! I'm probably not going to implement this, but would be open to a PR