# Computing the overlapping area of curves

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Deepa Maheshvare on 3 Jul 2022
Edited: Chunru on 4 Jul 2022
I have a set of datapoints corresponding to 5 curves.
scale = 1.5;
x1 = [0,4,6,10,15,20]*scale;
y1 = [18,17.5,13,12,8,10];
x2 = [0,10.5,28]*scale;
y2= [18.2,10.6,10.3];
x3 = [0,4,6,10,15,20]*scale;
y3 = [18,13,15,12,11,9.6];
x4 = [9,17,28]*scale;
y4 = [5,5.5,7];
x5 = [1,10,20]*scale;
y5 = [3,0.8,2];
plot(x1,y1, '*-', x2, y2, '*-', x3, y3, '*-', x4, y4, '*-', x5, y5, '*-')
I want to find the overlapping area under these curves.
Suggestions on the functions that could be uded to find the intersecting area and the x limits of the intersecting area will be really helpful.
Deepa Maheshvare on 4 Jul 2022
Thank you for the reply. I am interested in finding the area under each of the curve and visualize the area that overlaps.

Chunru on 4 Jul 2022
Edited: Chunru on 4 Jul 2022
scale = 1.5;
x{1} = [0,4,6,10,15,20]*scale;
y{1} = [18,17.5,13,12,8,10];
x{2} = [0,10.5,28]*scale;
y{2}= [18.2,10.6,10.3];
x{3} = [0,4,6,10,15,20]*scale;
y{3} = [18,13,15,12,11,9.6];
x{4} = [9,17,28]*scale;
y{4} = [5,5.5,7];
x{5} = [1,10,20]*scale;
y{5} = [3,0.8,2];
figure; hold on
xmin = -inf; xmax=inf;
for i=1:length(x)
area(x{i}, y{i}, 'FaceAlpha', 0.5); % visualize area with transparancy
a(i) = trapz(x{i}, y{i}); % compute area
xmin = max(xmin, min(x{i}));
xmax = min(xmax, max(x{i}));
end
xline([xmin xmax], 'LineWidth', 2)
legend
a
a = 1×5
369.7500 501.1125 379.5000 166.1250 46.6500
##### 2 CommentsShowHide 1 older comment
Chunru on 4 Jul 2022
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