axis labels not working

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))

Answer 1

[Walter Roberson]

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.

[Allen Antony]

I realised what the problem was with the code. The plot was meant to be

plot(current,ECG_Raw(current),'o')

However I now have another problem, the output from the loop itself is not what i want.

[Walter Roberson]

The code is identifying the correct trough for me with the test data I created. Can you attach your data for testing?