r - Rank each row in a data frame in descending order -


I want to apply rank by in each row in a data frame Am (data.frame, 1, rank) . However, Rank is ascending by default. So when I apply ranks () to my first line with values ​​(2,1,3,5), then I 

  [1] 2 1 3 4

However, I should 

  [1] 3 4 2 1 How can I do this? Data.frame, 1, rank) ?

Try
< P>

# [1] 2 1 3 4 rank (-v1) # [1] 3 4 2 1

data 
  Set.seed (24) data & lt; - as.data.frame (matrix (sample (1:20, 4 * 20, space = TRUE), ncol = 4))


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