Brian Sutton

Professor of mathematics at Randolph-Macon College. Author of Numerical Analysis: Theory and Experiments.

[Brian Sutton @SuttonBrianD]

@owickstrom Default prop would be “It doesn’t crash?” Anything else?

[Brian Sutton @SuttonBrianD]

@sp_monte_carlo I don’t see a name but Stewart and Sun give some history (Matrix Perturbation Theory p. 34)

[Brian Sutton @SuttonBrianD]

@ccanonne_ @aieaou Sounds like sin(d pi x). Just declare trigonometric polynomials \subset polynomials 😎

[Brian Sutton @SuttonBrianD]

@francoisfleuret One way to think about it: The columns of inv(A) are the solutions to Ax = e_j, in which e_j are the standard basis vectors. Examples that need solutions to all Ax = e_j?

[Brian Sutton @SuttonBrianD]

@solidangles 3. Some matrix symmetries are equivalent to commutativity relationships. For example, a complex symmetric (not Hermitian!) matrix has commuting real and imaginary parts. Can exploit numerically. See both papers by Bunse-Gerstner, Byers, and Mehrmann and my paper Sim. Diag….

[Brian Sutton @SuttonBrianD]

@solidangles 2. Quantum mechanics. Anybody know more about simultaneous observation? 2/

[Brian Sutton @SuttonBrianD]

@cutezu_ @sp_monte_carlo Trefethen & Bau discuss how any SVD alg must be iterative and therefore in theory requires ♾️’ly many steps. This makes time complexity tricky to define. A common approach is to first reduce to bidiagonal form. This is the more expensive phase, and it’s not so hard to count

[Brian Sutton @SuttonBrianD]

@csaez_math https://t.co/7DthbtDLlP

[Nick Higham @nhigham]

What Is the CS (Cosine-Sine) Decomposition? An SVD for orthogonal matrices. https://t.co/iaaxOrtCAd

[Brian Sutton @SuttonBrianD]

@owickstrom I'm on Mac. I'd prefer using nixpkgs or Cabal over Homebrew.

Here's an example video from someone else: https://t.co/rKiVYGxW1J. It moves at the pace of a screencast, but there is live video in a corner.

[Brian Sutton @SuttonBrianD]

Excited to see my book Numerical Analysis: Theory and Experiments in MAA Reviews!

https://t.co/DpqMLBEUKg

[David Frum @davidfrum]

Once you realize that "deep state" is code for "the rule of law," you can translate their jibberish into something more like English https://t.co/w2dM1JskHg

[Brian Sutton @SuttonBrianD]

Interpolation between data points can be way harder than you'd first guess.

https://t.co/ebDRbI1Dfg

[. @GregTSargent]

Dems are not making one of their best arguments:

That by obstructing the probe, Trump impeded the inquiry into not just his conduct, but also into the Russian attack on our political system.

Here's scholar Philip Bobbit on why this might be impeachable:

https://t.co/kZEpQBGj4S

[Brian Sutton @SuttonBrianD]

@2012hokie Hahaha. Now Federer is almost as cool as Djokovic.

[David Wragg is not here anymore. @dwragg]

Looks like this vehicle does a lot of commuting.

[George Wallace @MrGeorgeWallace]

Shout out to decimals, the periods of math and whatnot.