How can I get eigenvalues of matrix using Apache Commons Math? I know there is 2 classes EigenDecomposition and QRDecomposition, but how to combine them to get eigenvalues?
How to calculate eigenvalues using QR method?
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apete
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You seem to confuse the QR decomposition with the QR eigenvalue algorithm.
The QR decomposition cannot give you the eigenvalues of a matrix, but it can be used as a component to a more complex algorithm that produce eigenvalues and eigenvectors.
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Why combine them? QR can give you eigenvalues:
http://en.wikipedia.org/wiki/QR_algorithm