Abstract.
Suppose that an indefinite symmetric tridiagonal matrix permits triangular factorization T = LDLt . We provide individual condition numbers for the eigenvalues and eigenvectors of T when the parameters in L and D suffer small relative perturbations. When there is element growth in the factorization, then some pairs may be robust while others are sensitive. A 4 × 4 example shows the limitations of standard multiplicative perturbation theory and the efficacy of our new condition numbers.
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Parlett, . Perturbation of Eigenpairs of Factored Symmetric Tridiagonal Matrices . Found. Comput. Math. 3, 207–223 (2003). https://doi.org/10.1007/s10208-001-0051-5
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DOI: https://doi.org/10.1007/s10208-001-0051-5