Can't sort coordinates of peaks found in a 2D array

Hi everybody,

here's the mesh of a 2D matrix i'm working on. Matrix name is disp_curve.

As you can see, there are two groups of peaks. I have to find peaks coordinates and sort them in different columns of an array of coordinates, depending on the group they belong to. I've tried some user-made peak finders like extrema2.m, but it seems that they can't do the job. I've obained best results by implementing findpeaks in a for loop.

M = 2; %number of groups

[ nF, nK ] = size(disp_curve);

for i = 1:nF

      [pks, loc] = findpeaks(abs(disp_curve(i,:)),'NPeaks', M, 'SortStr','descend');

      peak_coord{i} = loc;

end

coord = zeros(nF, M);

for j = 1:nF

       coord(j,1) = peak_coord{j}(1);
       coord(j,2) = peak_coord{j}(2);

end

The code recognizes peaks correctly but sorts them in descending order, which may not be the correct one. I've also tried to implement 'MinPeakHeight' while removing 'SortStr' but then I get dimension mismatch errors when filling "modes" array, as there are a lot of rows where maximum value is under threshold (i.e. there's only one peak or no peaks at all). Any help is much appreciated.

Best regards

Stefano Fiorentini