How to get S.D of RRI sequnces using (1) Periodogram and (2) AR model method

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Hello Im a student from UESTC of china
I have this code
RRI=[];
for i=1:length(ROC)-1
RRinterval(i)=ROC(i+1)-ROC(i);
end
And I have already got RRI sequency but I need to Transform RRI(i) in time domain into frequency domain and then use it
1) To Get S.D of RRI(i) using periodogram
2) Get S.D of RRI(i) using AR modeling method.
Does anyone help me to have codes to solve this problem? please I need your help its hard time for me because this is my last year.

Posted 9-Dec-15 15:59pm

abu-fahmy

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Richard MacCutchan · Answer 1 · 2015-12-09T23:05:00

Solution 1

See http://uk.mathworks.com/help/images/ref/std2.html[^].

Posted 9-Dec-15 23:05pm

Richard MacCutchan