在matlab中,输入
>> A=sym('[1,7,3,5;7,1,7,3;3,7,1,5;5,3,5,1]')
A =
[ 1, 7, 3, 5]
[ 7, 1, 7, 3]
[ 3, 7, 1, 5]
[ 5, 3, 5, 1]
>> b=eig(A)
b =
-2
2 - (276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)/2 - 80/(3*(276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)) - (3^(1/2)*(160/(3*(276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)) - ((27^(1/2)*2039248^(1/2)*i)/27 + 276)^(1/3))*i)/2
2 - (276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)/2 - 80/(3*(276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)) + (3^(1/2)*(160/(3*(276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)) - ((27^(1/2)*2039248^(1/2)*i)/27 + 276)^(1/3))*i)/2
160/(3*(276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3)) + (276 + (27^(1/2)*2039248^(1/2)*i)/27)^(1/3) + 2
求得的结果好生奇怪了,不知道哪里出了问题,请帮我看看,不甚感激