MATLAB: Fill area between two curves

colouringcurvesfillareagraphspatchplots

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?

Best Answer

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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