How to integrate the area below the peak when I dont have function of the peak?

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I wanted to integrate the area below the shaded peak as shown in the image. The plot is taken from an experimental data so I dont have a function of my curve. How can I specify the limit and get the area below the shaded peak? The simple "trapz" function output is showing "NaN" and I understand I am not specifying the limits here. Can someone help me here. thank you.
% Integrate area below the peak
plot(AR_T,AR_mwmg) %AR_T and AR_mwmg are data stored in AR_data.mat file
int_AR = trapz(AR_T,AR_mwmg)
  3 Kommentare
sanjay Krishnamurthy
sanjay Krishnamurthy am 23 Mär. 2022
So, How can I proceed to obtain my objective to find the area below the peak?
AndresVar am 23 Mär. 2022
@sanjay Krishnamurthy use conditional indexing to select your data. see the answer for more info

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AndresVar am 23 Mär. 2022
Bearbeitet: AndresVar am 23 Mär. 2022
Use conditional indexing to define the limits of extent for the peak.
% remove nan values (why is there a nan at the end?)
idxNotNan = ~isnan(AR_T) & ~isnan(AR_mwmg);
x = AR_T(idxNotNan);
y = AR_mwmg(idxNotNan);
%[pkY, pkX, pkWidth, pkProm]=findpeaks(y,x,'NPeaks',1,'SortStr','descend')
idxPk = x>210 & x<325; % more or less...
xPk = x(idxPk);
yPk = y(idxPk);
hold on;
AreaFull = 0.1168
AreaPk = 0.1166

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