Return curve peak coordinates - not just the peak

Hi,

I'm trying to get the whole curve where a peak belongs to, such as what I have badly drawn on the image using red colour. Is there a way to perform this please?

Thanks

Answer 1

[Star Strider]

I would do something like this:

x = [1:17]*10;                                                  % Create Data
y = [0 1 0 2 0 9 0 3 0 1 0 2 0 9 0 3 0]*0.25;                   % Create Data

[pks1,locs1] = findpeaks(y, x, 'MinPeakHeight',2);
[pks2,locs2] = findpeaks(-y, x);

pk1_start = locs2(find(locs2 < locs1(1), 1, 'last'));           % Start Of First Peak
pk1_end = locs2(find(locs2 > locs1(1), 1, 'first'));            % End Of First Peak

... then do the same for the second peak, ‘locs1(2)’. With the start- and end-points, you can define the entire peak.

This makes some assumptions about your data, since I do not have them to work with. You will probably have to experiment with this idea for it to work with your data.

[Giorgis]

Apologies for the late response, it wasn't possible to reply earlier. This will work great in finding the peak and the approximation of the curve. Thanks a lot!

[Star Strider]

No worries! The longest time between my posting an Answer and the person replying to (and Accepting) it was 198 days.

My pleasure!