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Re: Octave 4.0.3: normxcorr2 producing unexpected result


From: oli
Subject: Re: Octave 4.0.3: normxcorr2 producing unexpected result
Date: Thu, 23 Mar 2017 13:04:51 -0700 (PDT)

I'm having the same issue. The expected values for the correlation are:

<http://octave.1599824.n4.nabble.com/file/n4682595/Screen_Shot_2017-03-23_at_13.png>
 

But I am getting this as well:

 Columns 1 through 8:

   1.00000  -0.50000  -0.50000  -1.00000  -0.50000       Inf   1.00000  
0.86603

 Columns 9 through 16:

   0.50000  -1.00000  -0.86603   0.50000   0.50000   1.00000  -0.50000 
-0.50000

I used the workaround mentioned  here
<https://discussions.udacity.com/t/problem-in-solution-quiz-find-template-1d-quiz/201134/6?u=olalonde>
  
to replace Inf by 0. 


 Columns 1 through 8:

   1.00000  -0.50000  -0.50000  -1.00000  -0.50000  0.00000   1.00000  
0.86603

 Columns 9 through 16:

   0.50000  -1.00000  -0.86603   0.50000   0.50000   1.00000  -0.50000 
-0.50000

According to this output, we can see there are maximums at indexes 1, 7 and
14. Strangely, `[val index] = max(c)` returns index 7 instead of 1 or 14.

I really feel there is a bug somewhere....



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