Search Results for author: Alex H. Barnett

Found 6 papers, 4 papers with code

Ensemble reweighting using Cryo-EM particles

no code implementations10 Dec 2022 Wai Shing Tang, David Silva-Sánchez, Julian Giraldo-Barreto, Bob Carpenter, Sonya Hanson, Alex H. Barnett, Erik H. Thiede, Pilar Cossio

Cryo-electron microscopy (cryo-EM) has recently become a premier method for obtaining high-resolution structures of biological macromolecules.

Accurate quadrature of nearly singular line integrals in two and three dimensions by singularity swapping

1 code implementation22 Oct 2019 Ludvig af Klinteberg, Alex H. Barnett

The method of Helsing and co-workers evaluates Laplace and related layer potentials generated by a panel (composite) quadrature on a curve, efficiently and with high-order accuracy for arbitrarily close targets.

Numerical Analysis Numerical Analysis

A parallel non-uniform fast Fourier transform library based on an "exponential of semicircle" kernel

4 code implementations21 Aug 2018 Alex H. Barnett, Jeremy F. Magland, Ludvig af Klinteberg

The nonuniform fast Fourier transform (NUFFT) generalizes the FFT to off-grid data.

Numerical Analysis Mathematical Software Numerical Analysis 65T50, 65T40, 65Y05, 68N01

A unified integral equation scheme for doubly-periodic Laplace and Stokes boundary value problems in two dimensions

2 code implementations24 Nov 2016 Alex H. Barnett, Gary Marple, Shravan Veerapaneni, Lin Zhao

We present a spectrally-accurate scheme to turn a boundary integral formulation for an elliptic PDE on a single unit cell geometry into one for the fully periodic problem.

Numerical Analysis 65N38, 65N80, 76D07, 76M50

Validation of neural spike sorting algorithms without ground-truth information

no code implementations27 Aug 2015 Alex H. Barnett, Jeremy F. Magland, Leslie F. Greengard

We describe a suite of validation metrics that assess the credibility of a given automatic spike sorting algorithm applied to a given electrophysiological recording, when ground-truth is unavailable.

Benchmarking Spike Sorting

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