On swapping diagonal blocks in real Schur form
Zhaojun Bai, James Weldon Demmel · Linear Algebra and its Applications · 1993
We discuss a new version of an existing algorithm for reordering the eigenvalues on the diagonal of a matrix in real Schur form by performing an orthogonal similarity transformation. A detailed error analysis and software description are presented. Numerical examples show the superiority of our algorithm over previous algorithms.