Wesley Tansey
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 Feb 24 comment Fastest way to solve linear system with block symmetric banded/Toeplitz matrix Updated permuted matrix posted. Feb 24 revised Fastest way to solve linear system with block symmetric banded/Toeplitz matrix Applied first-step suggestion Feb 24 comment Fastest way to solve linear system with block symmetric banded/Toeplitz matrix Oh, I see. I was looking at the wrong level of granularity. So if we treat the overall matrix as being a $2\times2$ block diagonal matrix then this will always be valid for my case. I will post the updated matrix example. Feb 24 awarded Commentator Feb 24 comment Fastest way to solve linear system with block symmetric banded/Toeplitz matrix Looks like the Cuthill-McKee algorithm will not work for me, as my $A$ blocks are not necessarily square. For instance, in the example above the first block is $5\times15$. Feb 24 asked Fastest way to solve linear system with block symmetric banded/Toeplitz matrix Sep 18 awarded Popular Question May 15 awarded Popular Question Apr 21 awarded Tumbleweed Nov 6 accepted Psuedo-inverse of block low-rank, symmetric matrix? Nov 6 comment Psuedo-inverse of block low-rank, symmetric matrix? Great! And would this approach still hold if the diagonal blocks were rank-1 plus a diagonal matrix? Nov 6 comment Psuedo-inverse of block low-rank, symmetric matrix? Is it possible to compute the Householder reflections in linear time or are they more expensive? It seems like that's the only potentially-costly part of this approach and I'm not finding any references for the complexity of computing them. Nov 6 asked Psuedo-inverse of block low-rank, symmetric matrix? Jul 2 awarded Curious May 5 comment Bayesian learning Yep. I was confusing the problem with another problem that I was working on. This is just a straight-forward application of Bayes rule. May 5 accepted Bayesian learning May 3 revised Bayesian learning deleted 2 characters in body May 3 asked Bayesian learning Mar 10 revised Understanding Blackwell's Approachability Theorem deleted 3 characters in body Mar 10 revised Understanding Blackwell's Approachability Theorem added 4 characters in body