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2$\begingroup$ That’s because the sequence is finite. Look at the documentation for the xcorr function, you’ll find your answer there. $\endgroup$– JdipCommented 2 days ago
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2$\begingroup$ You are not doing the correlations of a sine wave, but of truncated sine wave. For periodic signals you are better of doing a circular correlation instead of a linear one. $\endgroup$– HilmarCommented 2 days ago
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