Need to find the area between two functions

I've got the following code, Y is a numeric matrix. Using the trapz function I've been able to find the area under the curve. Is it possible to find the area under the curve above Y=0.8 and between X=-0.03 and 0.03. the graph is a bell shaped curve for reference

x = [1:9996];

y = [B1];

plot(x, y);

trapz(x,y)

[HighPhi]

what is your B1? I may be able to help you if I knew what was inside y.

[Kano Lewis]

thank you for your help,

B1 is the data in my excel spreadsheet from b27 to b(27+9996)

[Kano Lewis]

I imported it as a numerical matrix if this helps

Answer 1

[Cris LaPierre]

Find the area under each function separately, then subtract them.

Answer 2

[yanqi liu]

x = [1:9996];
y = [B1];
ind = y < 0.8;
x(ind) = [];
y(ind) = [];
plot(x, y);
trapz(x,y)