Change row order in a matrix/dataframe

Question

I need to change/invert rows in my data frame, not transposing the data but moving the bottom row to the top and so on. If the data frame was:

1 2 3 
4 5 6
7         


        

Answer 1

You can reverse the order of a data.frame using the dplyr package:

iris %>% arrange(-row_number())

Or without using the pipe-operator by doing

arrange(iris, -row_number())