Alex Townsend

Orcid: 0000-0002-8183-7077

According to our database1, Alex Townsend authored at least 66 papers between 2013 and 2024.

Collaborative distances:
  • Dijkstra number2 of four.
  • Erdős number3 of four.

Timeline

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Bibliography

2024
Leveraging the Hankel norm approximation and data-driven algorithms in reduced order modeling.
Numer. Linear Algebra Appl., August, 2024

Structured matrix recovery from matrix-vector products.
Numer. Linear Algebra Appl., January, 2024

Are Sketch-and-Precondition Least Squares Solvers Numerically Stable?
SIAM J. Matrix Anal. Appl., 2024

Extending Mercer's expansion to indefinite and asymmetric kernels.
CoRR, 2024

Numerical Instability of Algebraic Rootfinding Methods.
CoRR, 2024

How to reveal the rank of a matrix?
CoRR, 2024

Operator learning without the adjoint.
CoRR, 2024

2023
Parallel Algorithms for Computing the Tensor-Train Decomposition.
SIAM J. Sci. Comput., June, 2023

Learning Elliptic Partial Differential Equations with Randomized Linear Algebra.
Found. Comput. Math., April, 2023

Operator learning for hyperbolic partial differential equations.
CoRR, 2023

A Mathematical Guide to Operator Learning.
CoRR, 2023

ContHutch++: Stochastic trace estimation for implicit integral operators.
CoRR, 2023

Beyond expectations: Residual Dynamic Mode Decomposition and Variance for Stochastic Dynamical Systems.
CoRR, 2023

Avoiding discretization issues for nonlinear eigenvalue problems.
CoRR, 2023

Leveraging the Hankel norm approximation and block-AAA algorithms in reduced order modeling.
CoRR, 2023

Elliptic PDE learning is provably data-efficient.
CoRR, 2023

Tuning Frequency Bias in Neural Network Training with Nonuniform Data.
Proceedings of the Eleventh International Conference on Learning Representations, 2023

2022
Data-Driven Algorithms for Signal Processing with Trigonometric Rational Functions.
SIAM J. Sci. Comput., 2022

Learning Green's functions associated with time-dependent partial differential equations.
J. Mach. Learn. Res., 2022

Anderson acceleration based on the H-s Sobolev norm for contractive and noncontractive fixed-point operators.
J. Comput. Appl. Math., 2022

Matrix recovery from matrix-vector products.
CoRR, 2022

A Quadrature Perspective on Frequency Bias in Neural Network Training with Nonuniform Data.
CoRR, 2022

Learning Green's functions associated with parabolic partial differential equations.
CoRR, 2022

On the stability of unevenly spaced samples for interpolation and quadrature.
CoRR, 2022

Probabilistic Missing Value Imputation for Mixed Categorical and Ordered Data.
Proceedings of the Advances in Neural Information Processing Systems 35: Annual Conference on Neural Information Processing Systems 2022, 2022

A generalization of the randomized singular value decomposition.
Proceedings of the Tenth International Conference on Learning Representations, 2022

2021
Computing Spectral Measures of Self-Adjoint Operators.
SIAM Rev., 2021

Error Localization of Best L<sub>1</sub> Polynomial Approximants.
SIAM J. Numer. Anal., 2021

On the Compressibility of Tensors.
SIAM J. Matrix Anal. Appl., 2021

The ultraspherical spectral element method.
J. Comput. Phys., 2021

Rigorous data-driven computation of spectral properties of Koopman operators for dynamical systems.
CoRR, 2021

Arbitrary-Depth Universal Approximation Theorems for Operator Neural Networks.
CoRR, 2021

Data-driven Algorithms for signal processing with rational functions.
CoRR, 2021

Data-driven discovery of physical laws with human-understandable deep learning.
CoRR, 2021

An optimal complexity spectral method for Navier-Stokes simulations in the ball.
CoRR, 2021

2020
Computing with Functions in the Ball.
SIAM J. Sci. Comput., 2020

FEAST for Differential Eigenvalue Problems.
SIAM J. Numer. Anal., 2020

Over-parametrized neural networks as under-determined linear systems.
CoRR, 2020

Anderson Acceleration Using the H<sup>-s</sup> Norm.
CoRR, 2020

Fast algorithms using orthogonal polynomials.
Acta Numer., 2020

Rational neural networks.
Proceedings of the Advances in Neural Information Processing Systems 33: Annual Conference on Neural Information Processing Systems 2020, 2020

2019
Why Are Big Data Matrices Approximately Low Rank?
SIAM J. Math. Data Sci., 2019

A Sparse Spectral Method on Triangles.
SIAM J. Sci. Comput., 2019

Bounds on the Singular Values of Matrices with Displacement Structure.
SIAM Rev., 2019

Continuous Analogues of Krylov Subspace Methods for Differential Operators.
SIAM J. Numer. Anal., 2019

Stable Extrapolation of Analytic Functions.
Found. Comput. Math., 2019

Bounding Zolotarev numbers using Faber rational functions.
CoRR, 2019

2018
A Nonuniform Fast Fourier Transform Based on Low Rank Approximation.
SIAM J. Sci. Comput., 2018

Fast polynomial transforms based on Toeplitz and Hankel matrices.
Math. Comput., 2018

Chebyshev approximation and the global geometry of sloppy models.
CoRR, 2018

2017
Computing with Functions in Spherical and Polar Geometries II. The Disk.
SIAM J. Sci. Comput., 2017

Vector Spaces of Linearizations for Matrix Polynomials: A Bivariate Polynomial Approach.
SIAM J. Matrix Anal. Appl., 2017

On the Singular Values of Matrices with Displacement Structure.
SIAM J. Matrix Anal. Appl., 2017

Nice latent variable models have log-rank.
CoRR, 2017

2016
Computing with Functions in Spherical and Polar Geometries I. The Sphere.
SIAM J. Sci. Comput., 2016

Numerical Instability of Resultant Methods for Multidimensional Rootfinding.
SIAM J. Numer. Anal., 2016

2015
A Fast Analysis-Based Discrete Hankel Transform Using Asymptotic Expansions.
SIAM J. Numer. Anal., 2015

Computing the common zeros of two bivariate functions via Bézout resultants.
Numerische Mathematik, 2015

The automatic solution of partial differential equations using a global spectral method.
J. Comput. Phys., 2015

Are resultant methods numerically unstable for multidimensional rootfinding?
CoRR, 2015

2014
An Algorithm for the Convolution of Legendre Series.
SIAM J. Sci. Comput., 2014

A Fast, Simple, and Stable Chebyshev-Legendre Transform Using an Asymptotic Formula.
SIAM J. Sci. Comput., 2014

A practical framework for infinite-dimensional linear algebra.
Proceedings of the 1st First Workshop for High Performance Technical Computing in Dynamic Languages, 2014

2013
An Extension of Chebfun to Two Dimensions.
SIAM J. Sci. Comput., 2013

Fast and Accurate Computation of Gauss-Legendre and Gauss-Jacobi Quadrature Nodes and Weights.
SIAM J. Sci. Comput., 2013

A Fast and Well-Conditioned Spectral Method.
SIAM Rev., 2013


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