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Import Harminv 1.3.1 as math/harminv. Packaged for pkgsrc-WIP by Kamel Derouiche. Harminv is a free program (and accompanying library) to solve the problem of harmonic inversion, given a discrete-time, finite-length signal that consists of a sum of finitely-many sinusoids (possibly exponentially decaying) in a given bandwidth, it determines the frequencies, decay constants, amplitudes, and phases of those sinusoids.