### Find the Periodicity of Noisy Data using Autocorrelation method in MATLAB

Autocorrelation (short ACF, autocorrelation function) is a cross-correlation of a signal with itself. By correlating a signal with itself, repetitive patterns will stand out and make it much easier to see. The (discrete) autocorrelation of a signal x is defined by the following simple equation. The entire signal x is shifted by an offset j and then multiplied by the original signal. This…

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