https://portsfallout.com/fallout/1348405/
Fallout detail - math/sfft - FreeBSD pkg-fallout
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https://www.freshports.org/math/sfft
FreshPorts -- math/sfft: Optimized Sparse Fast Fourier Transform
sfft is a library to compute discrete Fourier transforms of signals with a sparse frequency domain, using an algorithm that is more efficient than other known...
freshportsmathoptimizedsparsefast