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When is it easy to invert a sparse matrix?

linear-algebra linear-solver sparse-matrix iterative-method reference-request

answered yesterday Reid.Atcheson 3,088

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34

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Solve for large array of PD matrices

linear-algebra python linear-solver matrix-factorization

answered yesterday Federico Poloni 6,678

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36

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Algebraic multigrid as solver and as preconditioner

linear-algebra linear-solver multigrid linear-system

answered Jan 24 at 0:32 Wolfgang Bangerth 45.5k

7

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560

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full rank update to cholesky decomposition for multivariate normal distribution

linear-algebra iterative-method

answered Jan 15 at 18:42 MeowBlingBling 111

2

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83

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Efficiently compute a projection matrix from Householders reflectors

linear-algebra lapack matrix-factorization projection

modified Jan 13 at 15:09 rchilton1980 3,791

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implicit vs. explicit domain decomposition methods

linear-algebra finite-element partitioning domain-decomposition

modified Jan 13 at 3:22 Wolfgang Bangerth 45.5k

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31

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C++ code Thomas algorithm for solving a pentadiagonal Ax=b

linear-algebra algorithms

asked Jan 4 at 16:31 user37907 1

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128

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linear-algebra probability

modified Jan 3 at 19:59 davidhigh 1,779

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104

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linear-algebra optimization inverse-problem

answered Dec 18 '20 at 22:52 Wolfgang Bangerth 45.5k

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187

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Symmetric matrix which satisfies conditions of the form $v_i^T X v_i = 0$

linear-algebra linear-solver linear-programming

modified Dec 16 '20 at 0:39 nkyraf33 51

6

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198

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Efficiently computing $e^{tX}$ for many different values of $t$

linear-algebra python matrix sparse-matrix

modified Dec 12 '20 at 20:54 Rodrigo de Azevedo 696

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56

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Upper bound on condition number in linear preconditioning

linear-algebra numerics iterative-method preconditioning

asked Dec 9 '20 at 23:09 randombeaver 11

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93

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Numerical Linear Algebra: When to use Direct methods versus iterative methods to solve a linear system - for PDEs in particular

linear-algebra numerics iterative-method matrix-factorization linear-system

answered Dec 7 '20 at 17:51 Wolfgang Bangerth 45.5k

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Given an unpivoted form of Aasen's algorithm, how does one add pivoting?

linear-algebra

modified Dec 5 '20 at 13:45 ogogmad 151

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