fft via a radix2 algorithm that "recurses" by calling matlab's fft. Rather quick on repeated calls for fft's of the same size, due to persistent variables, but still a little bit slower than matlab's builtin fft.
There is no advantage to using this code over the builtin fft.
Handles complex, vector inputs.
Stephen Becker (2022). persistent fft (https://www.mathworks.com/matlabcentral/fileexchange/18892-persistent-fft), MATLAB Central File Exchange. Retrieved .
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