Parlett The Symmetric Eigenvalue Problem Pdf Online

The basic idea of the QR algorithm is to decompose the matrix A into the product of an orthogonal matrix Q and an upper triangular matrix R, and then to multiply the factors in reverse order to obtain a new matrix A' = RQ. The process is repeated until convergence.

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Here's a write-up based on the book:

The problem can be reformulated as finding the eigenvalues and eigenvectors of the matrix A. The basic idea of the QR algorithm is

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