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math.NA2024
A Nonuniform Fast Hankel Transform
Paul G. Beckman, Michael O'Neil
We describe a fast algorithm for computing discrete Hankel transforms of moderate orders from nonuniform points to nonuniform frequencies in operati…
stat.CO2024
Fast Adaptive Fourier Integration for Spectral Densities of Gaussian Processes
Paul G. Beckman, Christopher J. Geoga
The specification of a covariance function is of paramount importance when employing Gaussian process models, but the requirement of positive definiteness severely limits those use…