How can I fill the area under a curve with different colors?

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Navid
Navid 2023-11-12
编辑： Matt J 2023-11-12
Hi. I want to inquire about filling the area under a curve with distinct hues. Your assistance with this matter would be greatly appreciated. Thank you.

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采纳的回答

Voss
Voss 2023-11-12
Ran in:
Here's one way:
x = 1:100;
y = log(x);
xb = [1 15 55.5 100];
yb = interp1(x,y,xb);
plot(x,y)
hold on
colors = 'gyr';
for ii = 1:numel(xb)-1
idx = (x >= xb(ii)) & (x < xb(ii+1));
x_fill = [xb(ii), xb(ii), x(idx), xb(ii+1), xb(ii+1)];
y_fill = [0, yb(ii), y(idx), yb(ii+1), 0 ];
fill(x_fill,y_fill,colors(ii));
end

更多回答（2 个）

John D'Errico
John D'Errico 2023-11-12
Simple.
Just use fill (or patch) to fill THREE patches, each with the desired color. How can it be any simpler?
Or, you could build 3 polyshapes, then plot then with the desired color. Again, quite easy.
Matt J
Matt J 2023-11-12
编辑：Matt J 2023-11-12
Ran in:
One way:
x=0:0.01:4;
y=1-exp(-x);
color={'g','y','r'};
edges=0:4;
for i=1:3
r=(edges(i)<=x)&(x<=edges(i+1));
area(x(r), y(r), FaceColor=color{i}); hold on
end; hold off

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