How to find x range value and calculate average of corresponding peaks in a graph signal?

Hi everybody,

I need help for this task: I have a graphs with irregular peaks derived from matrices data and I would like to automatically calculate for each set of data the x range where peaks occur and the mean value of each peak.

I hope I will be more clear showing an example. Every peak in the bigger graph corresponds to a series of irregular peaks (an example is shown in the little graph, which represents the first peak).

Thanks for attention!

Answer 1

[darova]

Try this;

index = find(y>100);                            % find peaks
ind = find( diff(x(index)) > 0.01 );            % find start and end of peak searies
index = [index(1) index(ind+1);                 % first row - start of series
        index(ind) index(end)];                 % second row - end series

Answer 2

[Image Analyst]

Try this:

threshold = 1000; % Whatever....
index1 = find(y > threshold, 1, 'first');
index2 = find(y > threshold, 1, 'last');
newY = y(index1 : index2); % Final result extracted from original y