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Yes, I think it'd be nice to mention this for rfft, rfftn, and ihfft. Usually, the n or s input argument defines the length of the output along the transformed axis (and other axes have the same lengths), but for the 3 APIs doing R2C transform, n/s is for the input not output.
The fft functions do not specify what the output axis size should be. This is not necessarily always the same as the input axis size (or
n
).For example, NumPy's
ihfft
uses an output shape ofn//2 + 1
(https://numpy.org/doc/stable/reference/generated/numpy.fft.ihfft.html). This size is not mentioned anywhere in the spec.The text was updated successfully, but these errors were encountered: