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

I would reverse the rows an index starting with the number of rows, along this line

revdata <-  thedata[dim(thedata)[1L]:1,]