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autocorrelation

From: Francesco Potorti`
Subject: autocorrelation
Date: Thu, 27 Apr 1995 14:32 +0100 (MET) 
I need to compute the autocorrelation of vectors.  I started with the
following experiment:

kk=[2,3,4,5]
kk =

  2  3  4  5

fftconv(kk,kk)
ans =

   4  12  25  44  46  40  25

I would have expected 

   10  23  38  54  38  23  10

instead.  What am I doing wrong?
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