inserting submatrices within a larger matrix

Hello,
I am trying to add 4 different submatrices (4 x4 elements) along the diagonal of a a larger 16 x 16 matrix. the end result would look like:
submatrix_1 0...
0 0 0 0 sumatrix_2 0...
0 ... sumatrix_3 0 0 0 0
0 ... sumatrix_4
Any suggestions would be welcome! Thanks

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on 6 Apr 2011

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