eigen_inv Subroutine
public subroutine eigen_inv(A, v, lambda, p, maxIter, err_v, v_0)
Given the matrix A, computes the eigenvector v associated to the eivenvalue lambda closer to the value p using the inverse power method.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real, | intent(in) | :: | A(:,:) |
Symmetric matrix |
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| real, | intent(out) | :: | v(size(A,1)) |
Eigenvector |
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| real, | intent(out) | :: | lambda |
Eigenvalue |
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| real, | intent(in) | :: | p |
value close to the eigenvalue wanted |
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| integer, | intent(in) | :: | maxIter |
Maximum number of iterations |
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| real, | intent(in) | :: | err_v |
Precision for the stop criterion |
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| real, | intent(in) | :: | v_0(size(A,1)) |
Initial vector for the iteration |