[SciPy-User] fast autocorrelation

Neal Becker ndbecker2@gmail....
Wed Feb 27 08:48:25 CST 2013

Pierre Barbier de Reuille wrote:

> scipy.fftpack has two functions for that: rfft and irfft. They are both
> faster than fft/ifft, so maybe you want to use that? Or is it still too
> slow?

I believe irfft will do complex->real (just as rfft does real->complex).

In this case, we have frequency domain values, but they are pure real.  So
we want ifft from real->complex.

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