Found one!

In Math::FFT the author has provided an easy way to use FFTs to calculate cross-correlation:

   $fft1 = new Math::FFT($data1);
   $fft2 = new Math::FFT($data2);
   $corr = $fft1->correl($fft2);

[download]

Look under Applications - Correlation in the documention of Math::FFT.

--

"Any sufficiently analyzed magic is indistinguishable from science" - Agatha Heterodyne

In reply to Re^2: Calculating cross-correlation by mykl
in thread Calculating cross-correlation by Anonymous Monk

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