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SymTridiagonalQL

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Diagonalization of (complex) symmetric tridiagonal matrices via QL factorization, as outlined in

  • Cullum, J. K., & Willoughby, R. A. (1996). A $QL$ procedure for computing the eigenvalues of complex symmetric tridiagonal matrices. SIAM Journal on Matrix Analysis and Applications, 17(1), 83–109. http://dx.doi.org/10.1137/s0895479894137639

  • Bowdler, H., Martin, R., Reinsch, C., & Wilkinson, J. (1968). Handbook series linear algebra. The $QR$ and $QL$ algorithms for symmetric matrices. Numerische Mathematik, 11, 293–306.