axis labels not working

Question

Allen Antony 2020-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/630899-axis-labels-not-working

评论： Walter Roberson 2020-10-30

Basically I was trying to do a while loop to find the s point of a qrs signal that has already filtered. I tried to use the statement provided below to find the S component, however it gave me the error that,." Index exceeds the number of array elements (1)". Was hoping someone could tell me what was wrong with while loop.

Thanks

%Simplied Version of previous stuff
ECG_Raw=Orig_Sig;
t=length(ECG_Raw);
[AmpRC,TimeRC]=findpeaks(Orig_Sig,'MinPeakDistance',120,'MinPeakHeight',150);
TimeR=TimeRC';
% While loop statement which I am having problems with
current=TimeR(1);
next=current+1;
while Orig_Sig(current)>=Orig_Sig(next)
    current=next;
    next=next+1;
end
plot(t(current),Orig_Sig(current))

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Answer 1

Walter Roberson 2020-10-30

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Suppose there is only one peak detected, and that everything from there on is non-increasing.

and the position of the * is returned. Then for each point from there on, the signal value at the "current" point is >= the signal value of the "next" point. So as you move forward looking for an increase back, you run off the end of the array.

Now, that is a general problem with your algorithm. However you also have the much more specific problem that for some reason your Orig_Sig is only a single sample long.