version (2.05 KB) by Phillip M. Feldman
compute and plot estimate of the autocorrelation of an input sequence


Updated 10 May 2009

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acfplot calls autocov() to compute an extimate of the autocorrelation function (acf) of the input vector Y, and then plots the acf with the time axis labeled in units of either seconds or ms. Note: This function does not use the Statistics Toolbox.


acf= acfplot(Y, Fs, maxlag, titlestr)

Y is a column vector containing a sequence of samples. The remaining input arguments are optional. Fs specifies the sampling rate (samples per second); the default is 1. maxlag is the maximum lag for which the autocorrelation is to be computed; if no value is specified, a default value is generated by the function autocov. titlestr specifies a title to be printed at the top of the plot; the default is a null string.

Cite As

Phillip M. Feldman (2022). acfplot.m (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2008b
Compatible with any release
Platform Compatibility
Windows macOS Linux

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