Fast algorithm for extracting the diagonal of the inverse matrix with application to the electronic structure analysis of metallic systems. (English) Zbl 1182.65072

Summary: We propose an algorithm for extracting the diagonal of the inverse matrices arising from electronic structure calculation. The proposed algorithm uses a hierarchical decomposition of the computational domain. It first constructs hierarchical Schur complements of the interior points for the blocks of the domain in a bottom-up pass and then extracts the diagonal entries efficiently in a top-down pass by exploiting the hierarchical local dependence of the inverse matrices. The overall cost of our algorithm is \(O(N^{3/2})\) for a two dimensional problem with \(N\) degrees of freedom. Numerical results in electronic structure calculation illustrate the efficiency and accuracy of the proposed algorithm.


65F30 Other matrix algorithms (MSC2010)
65Z05 Applications to the sciences
81V45 Atomic physics
Full Text: DOI