MATLAB: I am trying to find the area as a part of a graph(Area-A and Area-B in the picture below). However, when I am using “trapz” function, it is not giving any output. Code is mentioned below and .mat file is attached. Please help me out.

trapz

clc;
a=importdata('anirban normal.mat');
b=a.data;
x=b(22810:25750,1);
figure();
plot(x);
Area=trapz(1:694);
x(x<0)=[];
findpeaks(x);
findpeaks(x,'MinPeakHeight',0.927);*

Best Answer

a=importdata('anirban normal.mat');
b=a.data;
x=b(22810:25750,1);
figure();
plot(x);
% Area=trapz(1:694);
id = 1:length(x) ;
% Int = trapz(id,x) ;
% x(x<0)=[];
% findpeaks(x);
% findpeaks(x,'MinPeakHeight',0.927);
[val,maxid] = max(x) ;
Area1 = trapz(id(1:maxid),x(1:maxid)) ;
Area2 = trapz(id(maxid:end),x(maxid:end)) ;
Area =  trapz(id,x) ;
Check Area = Area1+Area2
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