how to run an index loop while using find function

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Tipnirin Vajanarat
Tipnirin Vajanarat 2019-11-10
编辑： Tipnirin Vajanarat 2019-11-11
I have two sets of (time) array. By using the time of red mark(ECG) as indicated in the picture. I'm trying to sweep to the right by fixed range (peakgap) to find the blue mark by using find function with condition RpeakTime<PPG1peakTime<PPG1peakTime+peakgap.
I'm trying to figure it out to use find function with index loop. How can I get the answer data of every red plot in array using for loop.
this is my code but I know it does not work
PPG1Psize = numel(PPG1peakTime);
peakgap = ((PPG1Psize)/(3*tend)); %estimate delay time between each ECG peak
for j=1:numECG
[rows,columns] = find(PPG1peakTime>RpeakTime(i) & PPG1peakTime<(RpeakTime(i)+peakgap));
end
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Tipnirin Vajanarat
Tipnirin Vajanarat 2019-11-11
编辑：Tipnirin Vajanarat 2019-11-11
However I figure it out. but thank you for all the suggestions! really appreciate it
This is my code
k=1;
for i = 1:(numel(RpeakTime)-1) %% in case that last plot of ECG does not have following PPG
while PPG1peakTime(k) <= RpeakTime(i)
k=k+1;
if PPG1peakTime(k) > RpeakTime(i)
PAT(i) = PPG1peakTime(k) - RpeakTime(i);
end
end
end
PAT = PAT.';

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Star Strider
Star Strider 2019-11-10
‘But I'm stuck at finding a proper function to find A single PPG coordinate near ECG in fixed range and make it work with index loop. it sounds simple but I can not find a proper one.’
You may not need to use a loop, or find.
Try this:
EKGlocs = 1:20:250; % Create EKG R-Wave Locations
PPGlocs = 5+cumsum(randi([15 25], 1, 13)); % Create PPG Peak Locations
PPGdiff = bsxfun(@minus, PPGlocs, EKGlocs); % Differences Between Argument Vectors
PPGabs = EKGlocs + PPGdiff; % Absolute Values Of PPG Peak Indices
This would be easier with your data.

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