2 papers
math.NA2011
On the Subspace Projected Approximate Matrix method
Jan H. Brandts, Ricardo Reis da Silva
We provide a comparative study of the Subspace Projected Approximate Matrix method, abbreviated SPAM, which is a fairly recent iterative method to compute a few eigenvalues of a He…
math.NA2011
Normalitity preserving perturbations and augmentations and their effect on the eigenvalues
Ricardo Reis da Silva, Jan H. Brandts
We revisit the normality preserving augmentation of normal matrices studied by Ikramov and Elsner in 1998 and complement their results by showing how the eigenvalues of the origina…