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

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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.

Accepted Answer

Voss
Voss on 12 Nov 2023
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

More Answers (2)

John D'Errico
John D'Errico on 12 Nov 2023
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 on 12 Nov 2023
Edited: Matt J on 12 Nov 2023
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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