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math.NA2021
Hierarchical Orthogonal Factorization: Sparse Least Squares Problems
Abeynaya Gnanasekaran, Eric Darve
In this work, we develop a fast hierarchical solver for solving large, sparse least squares problems. We build upon the algorithm, spaQR (sparsified QR), that was developed by the…
math.NA2020
Hierarchical Orthogonal Factorization: Sparse Square matrices
Abeynaya Gnanasekaran, Eric Darve
In this work, we develop a new fast algorithm, spaQR -- sparsified QR, for solving large, sparse linear systems. The key to our approach is using low-rank approximations to sparsif…