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m <- matrix(1:25, nrow=5) print(m) # run: # # [,1] [,2] [,3] [,4] [,5] # [1,] 1 6 11 16 21 # [2,] 2 7 12 17 22 # [3,] 3 8 13 18 23 # [4,] 4 9 14 19 24 # [5,] 5 10 15 20 25 #