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NFFT is a software library, written in C, for computing non-equispaced fast
Fourier transforms and related variations. It implements the following
transforms:
1. Non-equispaced fast Fourier transform (NFFT)
- forward transform (NFFT), i.e. frequency to time/space domain
- adjoint transform (adjoint NFFT), i.e. time/space to frequency domain
2. Generalisations
- to arbitrary nodes in time and frequency domain (NNFFT)
- to real-valued data, i.e. (co)sine transforms, (NFCT, NFST)
- to the sphere S^2 (NFSFT)
- to the rotation group (NFSOFT)
- to the hyperbolic cross (NSFFT)
3. Generalised inverse transformations based on iterative methods, e.g.
CGNR/CGNE
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