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cross correlation between two different sections of two vectors.

Asked by Habtamu Tesfaw on 17 Mar 2019
Given two vectors A and B of equal length.
first i determined the value of the lag at which the cross correlation between A(1:100) and B(1:100) can be maximum in the ff way.
[r, lags]=xcorr(A(1:100),B(1:100))
[r_max,idx]=max(r)
lag_max=lags(idx)
is there any possibility that the value of lag_max to be different when we do the same for A(1:200) and B(1:200)? I get a little bit different value in my case, but I can't figure out the physical resean.

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