I extract the global stiffness matrix from Abaqus. Here are some of the lines contained in the file:
row Column Value
1 1 6.835663422791815e+09
1 2 1.275539398193359e-05
2 1 1.275539398193359e-05
1 4 -6.152155805863143e-24
4 1 -6.152155805863143e-24
1 5 -1.676380634308013e-08
.
.
Then, I create the global stiffness matrix with Matlab, and after that, I obtained the eigenvectors and diagonal eigenvalues with the use of this syntax:
[phi, W2]=eig(GlobalStiffness,GlobalMass);
The resulting matrices contain elements that appear to be incorrect. For instance, some of the elements of the diagonal eigenvalue matrix (W2) are getting infinite:
1569.3 0 0 0 ...
W2= 0 -Inf 0 0 ...
0 0 Inf 0 ...
0 0 0 Inf ...
and the first column of my eigenvector matrix (phi) is zero except for the element of first row:
-1
0
0
.
.
did you know what is the problem with my eigenvector matrix and diagonal eigenvalue matrix?
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