Suppose I have the A matrix like this:
A = [0,0,0,0,0,0,106,10,14,20,20,23,27,26,28,28,28,23,28,28,21,18,106,14,12, 17,16,15,22,19,20,18,21,23,23,18,17,15,106
If you want maximum 5 or 10 peaks, use the following
[peakVal,peakLoc]= findpeaks(A,'sort','descend');