【求助】6*6复矩阵如何进行酉变换得到两个3×3矩阵

[spy1120]

>> a=magic(6)
a =
35 1 6 26 19 24
3 32 7 21 23 25
31 9 2 22 27 20
8 28 33 17 10 15
30 5 34 12 14 16
4 36 29 13 18 11
>> a([1:3],[4:6])=0;a([4:6],[1:3])=0;
>> a
a =
35 1 6 0 0 0
3 32 7 0 0 0
31 9 2 0 0 0
0 0 0 17 10 15
0 0 0 12 14 16
0 0 0 13 18 11