xcorr zero lag

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Diego
Diego 2012-1-1
Dear all, How can I use xcorr for 0 lags? In the test I'm running I don't want to 'slide' one sequence over another but keep them fixed. Thanks in advance. Happy new year! Diego
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Diego
Diego 2012-1-1
I'm correlating sequences of length 8.
Is this right?
Thanks,
Diego
the cyclist
the cyclist 2012-1-1
I don't have the Signal Processing Toolbox, so I can't check myself, but the syntax in your first comment looks right to me. Can you give a more complete example of the code you have written, the result, and why specifically you believe it to be wrong (or not what you expect)?

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Wayne King
Wayne King 2012-1-1
Hi Diego, Why doesn't this work?
[c,lags] = xcorr(randn(1000,1),rand(1000,1),0,'coeff');
This gives you exactly what you have described; the cross correlation between two input vectors at zero lag.
c is the value of the normalized cross correlation sequence at zero lag.
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Diego
Diego 2012-1-1
ughh I'm so sorry for omitting the information... the code just grows a lot and is a little messy at this time.
P and Q are the same length.
Thanks for your patience!
P=[M(l,i:i+rep-1)];
Q=[M(z,j:j+rep-1)];
[m,d]=max(X1);
Diego
Diego 2012-1-3
It seems the problem was using the 'delay' for plotting.
I just removed it since at 0 lags it seems to be useless and the plot works as expected.
Many thanks,
Diego

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