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    %% Autocovariance of White Gaussian Noise
% Display the estimated autocovariance of white Gaussian noise,
% $c_{ww}(m)$, for $-10 \le m \le 10$. Reset the random number generator
% for reproducible results. Normalize the sequence so that it is unity at
% zero lag.

% Copyright 2015 The MathWorks, Inc.


%%

rng default

ww = randn(1000,1);
[cov_ww,lags] = xcov(ww,10,'coeff');

stem(lags,cov_ww)