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These return values associated with spectral transforms, or perform functions useful in conjunction with those.

- fft
Returns the real-valued Fourier transform.

- hilbert
Returns the forward or backward Hilbert transform.

- power
Returns the power spectrum.

- sc
Returns the sine and cosine transforms.

- scb
Returns the inverse sine and cosine transforms.

- swaphalf
Swaps "left" and "right" parts of an array in all of its dimensions.