Finding Primary voltage & the Main stress direction.

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Cillian
Cillian 2012-5-4
I try to find "primary voltage" and "the main stress direction." (I think they call, or elese it could be a bad translation)
And I find this example, and I understand it but not all of it.
M2 = eye(3); M2(1:2,1:2) = [1 2; 3 4];
[V, D] = eigs(M2)
V =
-0.4160 0 -0.8246
-0.9094 0 0.5658
0 1.0000 0
D =
5.3723 0 0
0 1.0000 0
0 0 -0.3723
M2=eye(3) told us that is 3x3 matrix.
And M2(1:2,1:2) = [1 2; 3 4]; I do not really understand, but I can see that [1 2; 3 4] are the vectors of the matrix. What M2(1:2,1:2) do?
[V, D] = eigs(M2), there D gives us the Diagonalization and V gives us ...? I don't know.
Hope you can help me out there.
Cheers Cillian

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