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A=[1 1 1;1 1 1;1 1 1];
[v,d]=eig(A)
v =

    0.4082    0.7071    0.5774
    0.4082   -0.7071    0.5774
   -0.8165         0    0.5774


d =

   -0.0000         0         0
         0         0         0
         0         0    3.0000
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