Shading an area between two intervals on a plot

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Lui
Lui 2020-8-8
评论： Star Strider 2020-8-9
Hi everyone.
I have a vector of length 100 which I have plotted to yield a graph. I would like to shade the area under the graph segmented by the two lines using the area function.
I have tried the following code and it is unfortunate that it sheds the whole area. Any help will be appreciated.
iz=linspace(15,20,6); % iz is the interval between the two xlines
yz=(FF(:,15:20)); % FF is the vector that generates the plot
area(iz,yz) % this should give me the area between two, shaded
Any corrections or better pointers are welcome.

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Star Strider
Star Strider 2020-8-9
It is likely not possible to use area for this, since that is not how it was designed to be used.
It is possible to use patch, however.
Try this:
x = linspace(0, 100);
y = x.*exp(-0.07*x);
figure
plot(x, y)
q2 = ylim;
hold on
L = (x>15) & (x<20);
patch([x(L) fliplr(x(L))], [y(L), ones(1,nnz(L))*min(ylim)],'r')
hold off
grid
.

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