MATLAB: Area between two points and a curve

areabetweencurveintegratingpoints

Hi All,
I want to find the area between a curve and two points. The equation is:
>> syms x
>> x4=1.18:0.0000001:3;
>> y4=-2*exp(-(x4).^2);
>> graph4= plot(x4,y4);
I want the area to the left hand side! points: (1.18,-0.5) and (1.18,0).
Any thoughts?
Thank you
Auntitled.jpg

Best Answer

Hi,
the whole area of your figure is a rectangle with area: (3-1)*(0-(-0.5).
If you calculate the integral of your curve in the bounds f(×)=-0.5 (find corresponding x (=1.18(?))) and x=3, you can subtract both values from eachother and you get the green marked area.
Best regards
Stephan
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