反演基本问题

ans =

1.5803

>> lamda=eig(A)

lamda =

1.4410 0.0000

>> inv(A)

ans =

1.0e+08 *

0.1441 -0.8648 -0.2161 1.2969

>> norm(inv(A))*norm(A)

ans =

2.4973e+08

>> x=inv(A)*b x =

2.0000 -2.0000

>> x1=A\\b x1 =

2.0000 -2.0000