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Fast Eigenvalue Decomposition of Arrowhead and Diagonal-Plus-Rank- k Matrices of Quaternions

Author

Listed:
  • Thaniporn Chaysri

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Rudjera Boškovića 32, 21000 Split, Croatia)

  • Nevena Jakovčević Stor

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Rudjera Boškovića 32, 21000 Split, Croatia)

  • Ivan Slapničar

    (Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Rudjera Boškovića 32, 21000 Split, Croatia)

Abstract

Quaternions are a non-commutative associative number system that extends complex numbers, first described by Hamilton in 1843. We present algorithms for solving the eigenvalue problem for arrowhead and DPRk (diagonal-plus-rank- k ) matrices of quaternions. The algorithms use the Rayleigh Quotient Iteration with double shifts (RQIds), Wielandt’s deflation technique and the fact that each eigenvector can be computed in O ( n ) operations. The algorithms require O ( n 2 ) floating-point operations, n being the order of the matrix. The algorithms are backward stable in the standard sense and compare well to the standard QR method in terms of speed and accuracy. The algorithms are elegantly implemented in Julia, using its polymorphism feature.

Suggested Citation

  • Thaniporn Chaysri & Nevena Jakovčević Stor & Ivan Slapničar, 2024. "Fast Eigenvalue Decomposition of Arrowhead and Diagonal-Plus-Rank- k Matrices of Quaternions," Mathematics, MDPI, vol. 12(9), pages 1-21, April.
    • Handle: RePEc:gam:jmathe:v:12:y:2024:i:9:p:1327-:d:1383966
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