Matrix Construction

Write a function called trio that takes two positive integer inputs n and m. The function returns a 3n-by-m matrix called T. The top third of T (an n by m submatrix) is all 1s, the middle third is all 2-s while the bottom third is all 3-s. For an example,see the code below:

M = trio(2,4)

M =
     1     1     1     1
     1     1     1     1
     2     2     2     2
     2     2     2     2
     3     3     3     3
     3     3     3     3

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