Plotting Area of a function

Rodrigo Toledo

2021 3 30

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0 个投票

Hello,

I have this function:

fun = @(x) (x^2 + 2)
q=int(fun,x,[-1,2])
q=9

How do i plot this fun function with the shaddes are betweeen -1, 2 of the integral?

Thanks

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Star Strider 2021-3-30

在 MATLAB Online 中打开

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I am not sure what you want.

Try this:

fun = @(x) (x.^2 + 2)
q = integral(fun,-1,2)
xv = linspace(-2,3);
xseg = xv(xv>=-1 & xv<=2);
figure
plot(xv, fun(xv))
hold on
patch([xseg fliplr(xseg)], [fun(xseg) zeros(size(xseg))], 'b', 'FaceAlpha',0.25) 
hold off
text(mean(xseg), q*0.1, sprintf('$\\int_{%d}^{%d}x^2+2 dx = %d$',-1,2,q), 'Horiz','center', 'Vert','middle', 'Interpreter','latex')