Plotting Area of a function

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

Answer 1

[Star Strider]

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')

.

[Rodrigo Toledo]

this is exactly what i needed. Thanks.

[Star Strider]

As always, my pleasure!