graph - Using findpeaks and minpeakdistance in MATLAB to find peaks separated by distance rather than index -

i'm trying x-coordinates of peaks in matlab figure (example attached). i've been using findpeaks, doesn't seem fact i'm plotting points rather lines.

i won't have 2 peaks. i'll have three, i'll have one. multiple peaks separated @ least 1/4 of range of x, , peaks @ least twice noise level.

here's expect work:

[pks,locs] = findpeaks(ydata,...                        'sortstr','descend',...                        'minpeakdistance',floor(range(xdata)/4),...                        'minpeakheight',floor(max(ydata)/2)...                        ) 

instead of getting 2 peaks, 4 bundled around first peak:

>> locs  locs =      6774      166785      326792      486799 >> xdata(locs)  ans =   -96780.787939025         -96770.1800919265    -96770.8959353367        -96771.6117787468 

i assume minpeakdistance working on in xdata indices rather data itself. how use distances between peaks instead of distance between indices of peaks?

findpeaks doesn't know x-coordinates or have plotted. need specify minpeakdistance in terms of indices. here's example:

xdata = -100:1:-1; ydata = rand(1,100); ydata(10) = 100; % peak ydata(11) = 99; % not peak ydata(50) = 100; % peak ydata(51) = 99; % not peak [pks,locs] = findpeaks(ydata,...                        'sortstr','descend',...                        'minpeakdistance',floor(length(ydata)/4),...                        'minpeakheight',floor(max(ydata)/2)...                        );   xlocs = xdata(locs);  pks =     100   100   locs =      10    50