The sequence of the matrix after xcorr function

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Fan Li 2017-12-22

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https://ww2.mathworks.cn/matlabcentral/answers/374254-the-sequence-of-the-matrix-after-xcorr-function

回答： Fan Li 2017-12-23

Hi every one I am beginner of matlab. I want to use the xcorr function to calculate the correlation function. My input is a matrix A,let say each column of the matrix A is A1 A2 A3 B1 B2 B3. Because the the function of r=xcorr(A) returns r whose columns contain the autocorrelation and cross-correlation sequences for all combinations of the columns of A, so the results have 36 columns. I wander the sequence of the of the 36 columns, because there are some unwanted results.

Thanks

Fan Li

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David Goodmanson 2017-12-22

from 'help xcorr':

C = xcorr(A), where A is an M-by-N matrix (M>1), returns a large matrix with 2*M-1 rows and N^2 columns containing the cross-correlation sequences for all combinations of the columns of A; the first N columns of C contain the delays and cross correlations using the first column of A as the reference, the next N columns of C contain the delays and cross correlations using the second column of A as the reference, and so on.

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