MATLAB: How to became the Tridiagonal matrix

MATLABrref

B=[
    16,   2  ,   3,    13;...
     5 ,  11,  10,     8;...
     9 ,   7 ,   6,    12;...
     4,  14,  15,    1]
How to became my Tridiagonal matrix 
16	0	0	0
5	2	0	0
9	11	3	0
4	7	10	13
0	14	6	8
0	0	15	12
0	0	0	1

Best Answer

full(spdiags(B',0:-1:-3,7,4))
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