# Fill area between two curves

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Shri Harsha Bharadwaj 2021년 2월 16일
댓글: Star Strider 2021년 5월 14일
Hello,
I am tring to fill the area between the two ellipses. I am importing the values from Excel to plot the figure. After that I would like to fill the two ellipses with two different colors. How do I do that?.
CODE:
clc
clear all
x = Phase1.x;
y = Phase1.z;
plot(x,y);
fill(x,y,'g');
hold on
a = Phase1.a;
b = Phase1.b;
plot(a,b);
% fill(a,b,'q')
x,y,a and b are the names of the four columns that I have imported from excel. x,y represents the bigger ellipse. I tried using some of the patch codes, but it did not work out. Can someone please help me with this?
##### 댓글 수: 1표시숨기기 없음
Adam Danz 2021년 4월 2일
Just FYI so you don't have to wait for your answers in the future, this topic has been addressed many times in the forum and there is a clear example in the patch documentation.

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### 채택된 답변

Star Strider 2021년 2월 16일
Try something like this:
t = linspace(0, 2*pi);
x = ([1;2]*cos(t)).'; % Produces (Nx2) Matrix
y = ([1;2]*sin(t)).'; % Produces (Nx2) Matrix
figure
patch([x(:,2); flipud(x(:,1))], [y(:,2); flipud(y(:,1))], 'g', 'EdgeColor','none') % Create ‘patch’ Object
hold on
plot(x(:,1), y(:,1), '-r') % Circle Outlines
plot(x(:,2), y(:,2), '-r') % Circle Outlines
hold off
axis('equal')
If your data are row vectors, do this:
patch([x fliplr(a)], [y fliplr(b)], 'g')
If they are column vectors:
patch([x; flipud(a)], [y; flipud(b)], 'g')
That should work.
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Star Strider 2021년 5월 14일
As always, my pleasure!
Apparently the data file changed (I have been away doing other things), since it is not the same one I initially plotted.

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