Fill area between two curves

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Shri Harsha Bharadwaj
Shri Harsha Bharadwaj el 16 de Feb. de 2021
Comentada: Star Strider el 14 de Mayo de 2021
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
load Phase12.mat
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?
  1 comentario
Adam Danz
Adam Danz el 2 de Abr. de 2021
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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Respuesta aceptada

Star Strider
Star Strider el 16 de Feb. de 2021
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.
  36 comentarios
Shri Harsha Bharadwaj
Shri Harsha Bharadwaj el 13 de Mayo de 2021
Thanks for the help sir. I was testing it out. Thanks a ton again.
Star Strider
Star Strider el 14 de Mayo de 2021
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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