Symbolic calculation

2012 5 9
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Hi, consider following commands:
syms a b c;
A=[a b;b c];
[R1,e]=eig(A);
rhs=matlabFunction(R1);
Now I would like to calculate the eigenvalue of [1 2;2 3], So I write:
[Rn,en]=eig([1 2;2 3])
Result in this case is:
Rn =
-0.8507 0.5257
0.5257 0.8507
But if I use symbolic formula:
rhs(1,2,3)
ans =
-1.6180 0.6180
1.0000 1.0000
Why are they different? What is wrong with my calculation?

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Oleg Komarov
Oleg Komarov 2012-5-9

0 个投票

You are comparing eigenvectors, which need not be unique.
Comparing eigenvalues:
rhs = matlabFunction(e);
rhs(1,2,3)
en

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