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How to fill color between two curves?

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Aditya Zade
Aditya Zade 2023-9-28
评论： Aditya Zade 2023-9-28
clc
clear
x(1) = 0 ;
y(1) = 0 ;
for i = 1 : 1 : 99
x(i+1) = i^2 ;
y(i+1) = 50 * i ;
end
figure(1)
plot(x)
hold on
plot(y)
grid on

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采纳的回答

Star Strider
Star Strider 2023-9-28
编辑：Star Strider 2023-9-28
Ran in:
If you only want the region between the curves before or after they cross, use ‘logical indexing’.
Try this —
% clc
% clear
i = 1:99;
x = [0 i.^2];
y = [0 50*i];
iv = 1:numel(x);
Lv = x <= y; % Logical Vector
figure(1)
plot(x, 'LineWidth',1, 'DisplayName','x')
hold on
plot(y, 'LineWidth',1, 'DisplayName','y')
patch([iv(Lv) flip(iv(Lv))], [x(Lv) flip(y(Lv))], 'r', 'EdgeColor','none', 'DisplayName','Before Inmtersection')
patch([iv(~Lv) flip(iv(~Lv))], [x(~Lv) flip(y(~Lv))], 'g', 'EdgeColor','none', 'DisplayName','After Intersection')
hold off
grid on
legend('Location','best')
EDIT — (28 Sep 2023 at 11:25)
Æsthetic improvements.
.
  3 个评论
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Aditya Zade
Aditya Zade 2023-9-28
Can you look into this as well?
https://www.mathworks.com/matlabcentral/answers/2026949-how-to-stack-up-multiple-cases-in-z-axis?s_tid=prof_contriblnk

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更多回答（1 个）

Mathieu NOE
Mathieu NOE 2023-9-28
Ran in:
hello
see below
FYI, your code does not need a for loop. Take advantage of matlab native vectorized operations
% y1(1) = 0 ;
% y2(1) = 0 ;
% for i = 1 : 1 : 99
%
% y1(i+1) = i^2 ;
% y2(i+1) = 50 * i ;
%
% end
x = 0:99;
y1 = x.^2 ;
y2 = 50*x ;
figure(1)
X=[x,fliplr(x)]; %#create continuous x value array for plotting
Y=[y1,fliplr(y2)]; %#create y values for out and then back
fill(X,Y,[0.9 0.9 0.9]); %#plot filled area
hold on
plot(x,y1,'r',x,y2,'m','linewidth',2)

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