MATLAB: How to find the average peak values and plot

@ star strider

Hi,
I got the attached plot from the code below. I would like to start the graph from 0.3 instead of 0 (y-axis) and then do the average of peaks. Average peaks should be like: average of first and second peak, then average of second and third peak and so on. Then plot them like the attached figure but with the average peak values. I would really apprecite if someone help me with that?
m=1000;
I1=0.5;
I2=0.3;
I3=0.2;
L1=70*m;
L2=140*m;
n1=2;
n2=1.444;
index=n2;
lam=m*(1.5:0.000001:1.6);
Q12=(4*pi*n1*L1)./lam;
Q23=(4*pi*n2*L2)./lam;
Q13=Q12+Q23;
I=I1+I2+I3+2*sqrt(I1*I2).*cos(Q12)+2*sqrt(I2*I3).*cos(Q23)+2*sqrt(I1*I3).*cos(Q13);
plot(lam,I);

Best Answer

Try this: 
m=1000;
I1=0.5;
I2=0.3;
I3=0.2;
L1=70*m;
L2=140*m;
n1=2;
n2=1.444;
index=n2;
lam=m*(1.5:0.000001:1.6);
Q12=(4*pi*n1*L1)./lam;
Q23=(4*pi*n2*L2)./lam;
Q13=Q12+Q23;
I=I1+I2+I3+2*sqrt(I1*I2).*cos(Q12)+2*sqrt(I2*I3).*cos(Q23)+2*sqrt(I1*I3).*cos(Q13);
I = I + 0.3;
[pks, locs] = findpeaks(I);
pks_avg_2 = movmean(pks,2, 'Endpoints','discard');                  % Means Of Consecutive Points With Full Windows (Averaging Two Peaks) Only
figure
plot(lam,I)
hold on
stairs(lam(locs(1:numel(pks_avg_2))), pks_avg_2, '-r')
hold off
grid
legend('Data', 'Mean Of Two Consecuitve Peaks', 'Location','S')
.
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