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matlabarea

Calculate area from Signal under basline

The Matlab code I have plots the following curve:

X1= 1:600;
plot (X1,tmp)

basline = 0;% level
area(tmp,basline,'FaceColor','g');

enter image description here

how can I calculate the area in the red circle?

Solution

  • You need to find the 2nd and 3rd zero cross (z2 and z3). then do a sum over the tmp. Something like this:

    X1= 1:600;
tmp = sin(0.03*X1);
plot (X1,tmp)
range = 209:314;
basline = 0;% level
area(tmp,basline,'FaceColor','g');
figure;area(tmp(range),basline,'FaceColor','g');

sum(tmp(range))

    enter image description here

    enter image description here