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Introduction
Notation, the NDFT and the NFFT
This section summarises the mathematical theory and ideas behind the NFFT.
Subsections
NDFT
Direct NDFT
Equispaced knots
Inverse NDFT
NFFT
The ansatz
The window function
The first approximation - cutting off in frequency domain
The second approximation - cutting off in time/spatial domain
The case
The algorithm
Window functions
Further NFFT papers
Inverse NFFT
Stefan Kunis 2004-09-03
