你做的A的开平方运算,反过来算一下就明白了:
B = [ 0.5537 + 0.4644i 0.8070 - 0.2124i; 1.2104 - 0.3186i 1.7641 + 0.1458i]
B =
0.5537 + 0.4644i 0.8070 - 0.2124i
1.2104 - 0.3186i 1.7641 + 0.1458i
>> B*B
ans =
1.0000 + 0.0001i 2.0001 + 0.0001i
2.9999 + 0.0001i 3.9999 + 0.0002i
精度原因,其实就是 1 2 ; 3 4