Reid
@reidatcheson.bsky.social
I like numerical analysis, linear algebra, computational math!
Disclaimer: Everything I say is probably wrong.
Disclaimer: Everything I say is probably wrong.
Some sparse matrices are so pathological & break direct solvers, preconditioners, and iterative methods on GPUs. Here I explore these “nightmare matrices” and show how deflation and block methods can reshape the problem into one GPUs actually like to run.
www.reidatcheson.com/sparse%20lin...
www.reidatcheson.com/sparse%20lin...
Nightmare Matrices: When Sparse Solvers Fail on GPUs
I introduce a new family of symmetric-positive-definite sparse matrices (“Nightmare matrices”) \(A\) that defeats all known preconditioners, sparse direct solvers, and Krylov iterative methods for sol...
www.reidatcheson.com
August 24, 2025 at 12:01 AM
Some sparse matrices are so pathological & break direct solvers, preconditioners, and iterative methods on GPUs. Here I explore these “nightmare matrices” and show how deflation and block methods can reshape the problem into one GPUs actually like to run.
www.reidatcheson.com/sparse%20lin...
www.reidatcheson.com/sparse%20lin...
recent little side-project: taking this "generalized QR factorization" to establish the spectral theorem for symmetric matrices www.reidatcheson.com/qr/dense/sol...
no new results, just fun new ways of arriving at existing ones
no new results, just fun new ways of arriving at existing ones
An Interesting Inverse Inequality: Proof
Here I show some of my internal thinking behind recent work where I prove a theorem that I stated as conjecture in an earlier, related manuscript. This arose from a thought I had a while ago: can we a...
www.reidatcheson.com
March 24, 2025 at 12:31 AM
recent little side-project: taking this "generalized QR factorization" to establish the spectral theorem for symmetric matrices www.reidatcheson.com/qr/dense/sol...
no new results, just fun new ways of arriving at existing ones
no new results, just fun new ways of arriving at existing ones
Coroutines are pretty cool
March 3, 2025 at 3:45 AM
Coroutines are pretty cool
I love dynamic dispatch
February 7, 2025 at 2:58 AM
I love dynamic dispatch
Reposted by Reid
people will speak about a game they played as a kid with the same reverence that they might a great song or novel, about how it engrossed them totally and completely. They may even tear up talking about it. and then you ask what game it was and it was Spongebob battle for bikini bottom
January 30, 2025 at 9:44 PM
people will speak about a game they played as a kid with the same reverence that they might a great song or novel, about how it engrossed them totally and completely. They may even tear up talking about it. and then you ask what game it was and it was Spongebob battle for bikini bottom
Reposted by Reid
Reposted by Reid
Reposted by Reid
I've solved all elder scrolls lore mysteries to my own satisfaction
December 31, 2024 at 12:12 AM
I've solved all elder scrolls lore mysteries to my own satisfaction
Reposted by Reid
honestly I rewatched this video today and I think it might be goated. It's so good. www.youtube.com/watch?v=Li-P...
Morrowind Doesn't Have Any Rivers
YouTube video by Any Austin
www.youtube.com
December 6, 2024 at 5:05 PM
honestly I rewatched this video today and I think it might be goated. It's so good. www.youtube.com/watch?v=Li-P...
Reposted by Reid
December 12, 2024 at 3:38 AM
Black Hole's Evil Twin - Gravastars Explained
YouTube video by Kurzgesagt – In a Nutshell
youtu.be
December 4, 2024 at 1:21 AM
omg my ps5 just gave me the ps1 intro
December 2, 2024 at 10:25 PM
omg my ps5 just gave me the ps1 intro
İ have a cool new linear algebra idea
December 2, 2024 at 2:57 AM
İ have a cool new linear algebra idea
Reposted by Reid
If you haven’t seen @anyaustin.bsky.social’s videos about video games on YouTube… you should. They’re cool. He goes into cool minutiæ like employment rates of various towns. This one is about power lines. He mentions a familiar twitter user that doesn’t seem to exist anymore
youtu.be/c3iqVTDXK1Y?...
youtu.be/c3iqVTDXK1Y?...
Do Los Santos’ Power Lines Connect To Anything?
YouTube video by Any Austin
youtu.be
November 28, 2024 at 12:12 AM
If you haven’t seen @anyaustin.bsky.social’s videos about video games on YouTube… you should. They’re cool. He goes into cool minutiæ like employment rates of various towns. This one is about power lines. He mentions a familiar twitter user that doesn’t seem to exist anymore
youtu.be/c3iqVTDXK1Y?...
youtu.be/c3iqVTDXK1Y?...