@guettel profile picture
Stefan Güttel @guettel
Joined August 2013
  • Tweets 609
  • Following 0
  • Followers 710
186 Photos and videos
Stefan Güttel retweeted
INEGO@inegomusic
18 Apr 2024
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 👇 fatsoma.com/e/848wbm7y/la/r5… See you down the front 🌠🎶🐝💫
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'Fast and exact fixed-radius nearest neighbor search based on sorting' now available @PeerJCompSci peerj.com/articles/cs-1929

Fast and exact fixed-radius neighbor search based on sorting

Fixed-radius near neighbor search is a fundamental data operation that retrieves all data points within a user-specified distance to a query point. There are efficient algorithms that can provide...

peerj.com
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Mathematicians use AI to identify emerging COVID-19 variants manchester.ac.uk/discover/ne…

Mathematicians use AI to identify emerging COVID-19 variants

Scientists at The Universities of Manchester and Oxford have developed an AI framework that can identify and track new and concerning COVID-19 variants and could help with other infections in the...

manchester.ac.uk
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I gave an informal talk on the CLASSIX clustering algorithm in our @nla_grp seminar yesterday. It contains some MATLAB and Python live demos. youtube.com/watch?v=Q-CQBEYX…

Fast and explainable clustering with CLASSIX

This is a talk on the CLASSIX clustering method given on 13 Decembe...

youtube.com
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Image segmentation in @MATLAB using CLASSIX link.medium.com/CAc0OnLjsFb

Image segmentation using CLASSIX

In this post I will demonstrate the use of CLASSIX’s new MATLAB implementation which is available on MATLAB File Exchange and GitHub. We…

link.medium.com
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Stefan Güttel retweeted
INEGO@inegomusic
7 Dec 2023
Yo 2024 !! We're back Tickets - fatso.ma/Y3J5 #newmusic #inego
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Clustering more than 5.7 million data points in less than 8 seconds with CLASSIX (when HDBSCAN would take an hour) link.medium.com/4TewjS4V5Eb

Clustering 5.7 million RNA sequences of coronavirus

In today’s post we apply CLASSIX, a fast and explainable clustering method, to analyze a dataset accompanying a paper by Cahuantzi et al…

link.medium.com
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Stefan Güttel retweeted
Kirk Soodhalter@KirkMSoodhalter
28 Nov 2023
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. arxiv.org/abs/2311.14206

GMRES with randomized sketching and deflated restarting

We present a new Krylov subspace recycling method for solving a linear system of equations, or a sequence of slowly changing linear systems. Our approach is to reduce the computational overhead of...

arxiv.org
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Happy to announce the release of the CLASSIX #clustering toolbox for @MATLAB github.com/nla-group/classix…

GitHub - nla-group/classix-matlab: Fast and explainable clustering in MATLAB

Fast and explainable clustering in MATLAB. Contribute to nla-group/classix-matlab development by creating an account on GitHub.

github.com
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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. github.com/nla-group/classix…
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New work on combining Krylov subspace recycling with randomized sketching for matrix functions and linear systems - arxiv.org/abs/2308.02290 (with Liam Burke @tcddublin)
A plot that shows how Krylov subspace recycling helps to reduce the error when solving a sequence of 20 problems while updating an augmentation space from one problem to the next. The new recycling method is rFOM, and srFOM is its combination with sketching.

ALT A plot that shows how Krylov subspace recycling helps to reduce the error when solving a sequence of 20 problems while updating an augmentation space from one problem to the next. The new recycling method is rFOM, and srFOM is its combination with sketching.

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Our apartment in Varna, Bulgaria, is right above the @twitter headquarters
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Stefan Güttel retweeted
INEGO@inegomusic
29 Jun 2023
#Manchester we are delighted to announce we will be returning to stage again @Gulliversmcr this Sept! Buzzin to be sharing the stage with such fantastic lineup curated by @afterallmusico1 Grab your tickets fast fatso.ma/X5Vz
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A sketch-and-select Arnoldi process. Using randomized sketching to compute a relatively well-conditioned basis of a Krylov space at low cost. Usually much better than truncated Arnoldi. arxiv.org/abs/2306.03592 (with Igor Simunec @scuolanormale)
A MATLAB plot comparing the condition numbers of Krylov bases computed with eight different quasi-orthogonalization processes.

ALT A MATLAB plot comparing the condition numbers of Krylov bases computed with eight different quasi-orthogonalization processes.
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Stefan Güttel retweeted
The University of Manchester@OfficialUoM
1 Jun 2023
🥳 We're number one in the UK, number one in Europe and second in the world for social and environmental impact in this year's @timeshighered University Impact Rankings. #THEimpact manchester.ac.uk/discover/ne…

The University of Manchester named number 1 in the UK, number 1 in Europe and second in the world...

The University is the only institution in the world to rank in the top 10 in every year the Times Higher Education (THE) Impact Rankings have existed.The University of Manchester has today been named...

manchester.ac.uk
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Great news that our Knowledge Transfer Project with @Arup has been recognised in that way. Thanks to everyone involved!
UoM Business Engagement and Knowledge Exchange@UoM_BEKE
9 May 2023
We are delighted that our #KTP with @Arup has been recognised as being Outstanding! ✨🏆 A massive congratulations and well done to all involved! 🖱️To find out how #KTP could support innovation in your organisation, click here: bit.ly/UoM_BEKE @OfficialUoM @UKRI_News
We are delighted that our #KTP with @Arup has been recognised as being Outstanding! A massive congratulations and well done to all involved.

ALT We are delighted that our #KTP with @Arup has been recognised as being Outstanding! A massive congratulations and well done to all involved.

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Stefan Güttel retweeted
Numerical Linear Algebra Group@nla_grp
29 Mar 2023
Chris Hickey wins Bronze Medal at STEM for Britain nla-group.org/2023/03/29/chr…
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Congratulations to Xinye Chen (@chenxinye2) who successfully defended his PhD thesis on "Fast aggregation-based algorithms for knowledge discovery" today. Many thanks to the examiners @TAH_Sci and @sdrelton and good luck for the next chapter Xinye! #proudsupervisor
Dr Xinye Chen, who just passed his PhD viva, with supervisor in front of the University of Manchester's new Engineering Campus MECD

ALT Dr Xinye Chen, who just passed his PhD viva, with supervisor in front of the University of Manchester's new Engineering Campus MECD

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Great to have @jitseniesen from @mathsleedsuni visiting us @ManUniMaths with a very interesting talk on 'Plasma simulations using Vlasov equations and particle-in-cell methods'
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Congrats to Chris Hickey @ArupUK for this achievement! Chris did a fantastic job making eigensolvers developed in our group (@nla_grp & @tisseurf) available to a global user base of @Oasys_Software. Funded by @innovateuk
Isaac Newton Institute@NewtonInstitute
7 Mar 2023
Congrats to Chris Hickey 🥉 (@ArupUK), Arkady Way 🥇 (@OxfordStats) and Jenny Power 🥈(@jennypowerhour, @MathsatBath) on their medal wins at @STEM4Brit yesterday! A true celebration of excellent mathematical research. Well done to them and the 17 other finalists for 2023 👏
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