Stefan Güttel

Professor of Mathematics @OfficialUoM & @RoyalSociety Industry Fellow.
I decompose matrices for a living.

[INEGO @inegomusic]

We are playing the awesome @AfterAllFest this weekend!!!!

Friends old and new come and join the party @thepeerhat on Sat night (on stage at 9). Buzzin to share a stage with so many awesome acts.

Get your tickets here 👇 https://t.co/Eg4DrjBzJv

See you down the front 🌠🎶🐝💫

[Stefan Güttel @guettel]

@SIAM_UKIE @LeedsUniComp Congrats Max!

[Stefan Güttel @guettel]

'Fast and exact fixed-radius nearest neighbor search based on sorting' now available @PeerJCompSci https://t.co/g9qXO4fpsT

[Stefan Güttel @guettel]

Mathematicians use AI to identify emerging COVID-19 variants https://t.co/mwxOh3Jrxl

[Stefan Güttel @guettel]

@reidatcheson Chebyshev interpolation of a step function?

[Stefan Güttel @guettel]

@reidatcheson One can sometimes do a little better by selecting the k vectors to orthogonalize against from *all* previous basis vectors, not just the latest ones https://t.co/DoBn2gDEDU

But the cond number will grow exponentially eventually for nonsymmetric A (see the thm).

[Stefan Güttel @guettel]

I gave an informal talk on the CLASSIX clustering algorithm in our @nla_grp seminar yesterday. It contains some MATLAB and Python live demos. https://t.co/Ai5xmTsyFD

[Stefan Güttel @guettel]

Image segmentation in @MATLAB using CLASSIX https://t.co/0heJghSzf3

[INEGO @inegomusic]

Yo 2024 !! We're back

Tickets - https://t.co/ZUHpfgY4uS

#newmusic #inego

[Stefan Güttel @guettel]

Clustering more than 5.7 million data points in less than 8 seconds with CLASSIX (when HDBSCAN would take an hour) https://t.co/EVe6wxkdok

[Stefan Güttel @guettel]

@MarcelSchweitz1 Nice work! We just posted https://t.co/TgHKe99DCB -- now I wonder how your algorithm would compare to using sketched GMRES for solving the linear system formulation of the matrix equation (with a Kronecker structured sketch operator)

[Kirk Soodhalter @KirkMSoodhalter]

New work on combining sketching and Krylov subspace recycling with Liam Burke from @MathsTCD and Stefan Güttel @guettel. New algorithm GMRES_SDR and theoretical analysis of sketched GMRES, which we build upon to analyse our new method. https://t.co/8riNUj25cV

[Stefan Güttel @guettel]

CLASSIX a new clustering method that provides textual and visual explanations of its outputs.

It is also super fast. It clusters 2 million data points in under a second on a laptop where DBSCAN would require an hour. https://t.co/qwyc5fkRq7

[Stefan Güttel @guettel]

Happy to announce the release of the CLASSIX #clustering toolbox for @MATLAB https://t.co/B0YLgd5GDZ

[Stefan Güttel @guettel]

@latzplacian I read "Counterexamples in Analysis" while studying Wegert's 4-semester Analysis course at Freiberg. These counterexamples really annoyed me and I much prefer Complex Analysis now 😅

[Stefan Güttel @guettel]

@OdedRechavi Pilot

[Stefan Güttel @guettel]

@Math_World_ 101 and many more (1 second)

[Stefan Güttel @guettel]

New work on combining Krylov subspace recycling with randomized sketching for matrix functions and linear systems - https://t.co/8GIXNNpsg1 (with Liam Burke @tcddublin)

[Stefan Güttel @guettel]

Our apartment in Varna, Bulgaria, is right above the @twitter headquarters

[Stefan Güttel @guettel]

@CompSysMed @FrancoisFages @_CIRM Any chance that slides and/or video of this talk could be made available please? Thanks