AREA UNDER CURVE (TRAPZ)

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Sasuka Teo
Sasuka Teo 2016-1-26
编辑： Siranjeevi Gurumani 2021-10-23
LET SAY MY DATA LIKE PICTURE ATTACHED. HOW CAN I CALCULATE THE AREA UNDER CURVE UNTIL BASELINE. FOR EXAMPLE:
y1=sin(x)
baseline=y2=3
how do i use trapz? trapz(x,y1) and ?

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回答（2 个）

Matt J
Matt J 2016-1-26
编辑：Matt J 2016-1-26
trapz(x,y1) - trapz(x,y2)
or
trapz(x,y3)
where y3=sin(x)-3.
Siranjeevi Gurumani
Siranjeevi Gurumani 2021-10-23
编辑：Siranjeevi Gurumani 2021-10-23
x = 0:0.1:2*pi;
y1 = sin(x);
y2 = 0.5;%range of sinx between [-1,1]
z = y1 - y2;
z(z<0) = 0;
Area_above_threshold = trapz(x,z)

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