4X4矩阵的分块如下：
1 | 2 3 4-------------------5 6 | 7 8 |9 10 | 11 12 |---------13 14 | 15 16
共分为5个子块，代号如下
a | b ------------------- | | d c | |--------- | e
MATLAB交互式指令如下：
>> a=1 a = 1 >> b=[2 3 4] b = 2 3 4 >> c=[5 6 9 10 13 14] c = 5 6 9 10 13 14 >> d=[7 8 11 12] d = 7 8 11 12 >> e=[15 16] e = 15 16 >> X=[a b;c [d;e]] X = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
