Highlight specific area of graph.

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Mughees Asif
Mughees Asif 2019-3-5
编辑： Star Strider 2019-3-5
I have the following code:
syms x y
y = -x;
fplot(x, y, 'k')
hold on
y = x.^2-4;
fplot(x, y, 'k')
hold off
xlim([-5 5])
ylim([-5 5])
box on
grid on
axis=gca;
axis.XAxisLocation = 'origin';
axis.YAxisLocation = 'origin';
title('Graph of y = xe^x')
xlabel('x')
ylabel('y')
which generates the following graph. Is there a way of colouring or highlighting the shaded area? Thank you.
graph_Mathworks.png

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采纳的回答

Star Strider
Star Strider 2019-3-5
编辑：Star Strider 2019-3-5
You have to change the code slightly to do this:
x = linspace(-5, 5, 1000);
y1 = -x;
y2 = x.^2-4;
lidx = y1 >= y2;
figure
plot(x, y1, 'k')
hold on
plot(x, y2, 'k')
patch([x(lidx) fliplr(x(lidx))], [y1(lidx), fliplr(y2(lidx))], 'g', 'FaceAlpha', 0.5) % <— ADD THIS LINE
hold off
xlim([-5 5])
ylim([-5 5])
box on
grid on
axis=gca;
axis.XAxisLocation = 'origin';
axis.YAxisLocation = 'origin';
title('Graph of y = xe^x')
xlabel('x')
ylabel('y')
Experiment to get the result you want.
EDIT — (5 Mar 2019 at 00:39)
Added plot image:

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