C
Chen Greif
Researcher at University of British Columbia
Publications - 72
Citations - 1951
Chen Greif is an academic researcher from University of British Columbia. The author has contributed to research in topics: Linear system & Matrix (mathematics). The author has an hindex of 22, co-authored 67 publications receiving 1695 citations. Previous affiliations of Chen Greif include Tel Aviv University & PTC.
Papers
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Journal ArticleDOI
Minimizing the Condition Number for Small Rank Modifications
Chen Greif,James M. Varah +1 more
TL;DR: Analytical results show that the minimum, which is not necessarily unique, can be obtained and expressed by a small number of eigenpairs or singular pairs.
Journal ArticleDOI
SYM-ILDL: Incomplete LDLT Factorization of Symmetric Indefinite and Skew-Symmetric Matrices
Chen Greif,Shiwen He,Paul Liu +2 more
TL;DR: SYM-ILDL is a numerical software package that computes incomplete LDLT (ILDL) factorizations of symmetric indefinite and real skew-symmetric matrices and includes two built-in iterative solvers.
Book ChapterDOI
Fast Katz and Commuters: Efficient Estimation of Social Relatedness in Large Networks
Pooya Esfandiar,Francesco Bonchi,David F. Gleich,Chen Greif,Laks V. S. Lakshmanan,Byung-Won On +5 more
TL;DR: An iterative algorithm is applied to computing: the score for a single pair of nodes, and the top-k nodes with the best scores from a given source node, and an algorithm that only accesses a small portion of the graph is proposed, related to techniques used in personalized PageRank computing.
Book ChapterDOI
Additive Schwarz with variable weights
TL;DR: Numerical experiments illustrating the potential of the proposed Additive Schwarz preconditioning of nonsymmetric systems using weights that change from one iteration to the next are presented.
Proceedings Article
Three results on the PageRank vector: eigenstructure, sensitivity, and the derivative
TL;DR: Three results on the PageRank vector shed light on the eigenstructure of a PageRank modified Markov chain and what happens when changing the teleportation parameter in thePageRank model.