Fast Grouped Transformations as introduced in Bartel, Potts, Schmischke, 2021 .
GroupedTransforms.jl provides the following fast algorithms:
- nonequispaced fast transformation with exponential functions for grouped index sets based on the NFFT (non-equispaced fast Fourier transform)
- nonequispaced fast transformation with cosine functions for grouped index sets based on the NFCT (non-equispaced fast cosine transform)
In Julia you can get started by typing
] add GroupedTransformsthen checkout the documentation.