Autocorrelation with big data

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Abdur Rob
Abdur Rob 2021-6-12
评论： Sulaymon Eshkabilov 2021-6-12
I have written this code to find autocorrlation
temp = xlsread('temp.xlsx');
tempnorm = temp - mean(temp);
fs = 2*24; % 2 times per hours
t = (0:length(tempnorm)-1)/fs;
plot(t, tempnorm); xlabel 'Time in days'; ylabel 'Temp'; axis tight
[autocor, lags] = xcorr(tempnorm, 3*7*fs, 'coeff');
plot(lags/fs, autocorr);
when i try to run this it shows
Index exceeds the number of
array elements (0).
Error in autocorr (line 143)
y = args{1};
please help me to figure it out

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采纳的回答

Sulaymon Eshkabilov
One typo that caused the error:
plot(lags/fs, autocor); % autocor is the variable name NOT autocorr

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