MATLAB: How to set a descend order finding peaks to the graph

Question

I have a graph that takes the values from first maximum peak point and plots it.Now,how shall i introduce a threshold or descend order from that point,so that it find the next highest peak ?

load('signal')
load('t')
S(:,1)=[ 5 15 35 45 5 15 35 45];
S(:,2)=[ 5 15 15 5 45 35 35 45];
 for k=1:1:length(S) 
[a(k),b2(k)]=max(abs(hilbert(signal(k,:)))); % first peak amp & index
    
 [PkAmp, PkTime] = findpeaks(abs(hilbert(signal(k,:))),t); 
  
  peaks(1,1)=a(k);
  peaks(2,1)=t(b2(k));
  
 j=2;
 for i=1:length(PkTime)   
 if PkTime(i)>t(b2(k))
     peaks(1,j)=PkAmp(i);
     peaks(2,j)=PkTime(i);
     j=j+1;
 end
 end
figure;  
    plot(t,(signal(k,:)),t,abs(hilbert(signal(k,:))),peaks(2,1),peaks(1,1),'ro')
    hold on;grid on
    plot(PkTime, PkAmp, '^r', 'MarkerFaceColor','r')
    xlim([0 0.0006]);ylim([-inf inf])
    hold on,plot(peaks(2,3),peaks(1,3),'ko')
    
 end
 
 

Answer 1

How about combining envelope and findpeaks functions?

The following is an example.

% Load data
load('signal.mat');
load('t.mat');
% Calculate envelope and detect it's peaks
ul = envelope(signal(1,:));
[pks,locs] = findpeaks(ul,t,'MinPeakProminence',0.5e-3);
% Show the result
figure
plot(t,signal(1,:))
hold on
plot(t,ul)
scatter(locs,pks,'rv')
legend({'Original data','Envelope','Peaks'},'FontSize',12)