Plotting multiple objects on same axis

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I am new to MATLAB but I am trying to plot multiple circles on the same axis. I am using rand function to generate the centers because I want some of them to overlap, but it ends up plotting just one circle. Below is my code;
r = 0.005; x = rand(100,1); y = rand(100,1); th = 0:pi/100:2*pi; for i = 1:length(x) & 1:length(y) a = r*cos(th) + x(i); b = r*sin(th) + y(i); axis tight; hold on plot(a,b) end

Accepted Answer

Kevin Chng
Kevin Chng on 26 Oct 2018
Edited: Kevin Chng on 26 Oct 2018
r = 0.005;
x = rand(100,1);
y = rand(100,1);
th = 0:pi/100:2*pi;
for i = 1:1:length(x)
a = r*cos(th) + x(i);
b = r*sin(th) + y(i);
figure(1)
axis tight;
hold on
plot(a,b)
pause(0.1)
end
Slight change your code, it is very interesting, if you add pause(), then you see the animation. However, you delete the pause() if you don't want it.

More Answers (3)

madhan ravi
madhan ravi on 26 Oct 2018
Edited: madhan ravi on 26 Oct 2018
r = 0.005;
x = rand(100,1);
y = rand(100,1);
th = 0:pi/100:2*pi;
a=zeros(1,numel(x)) % preallocation for speed and efficiency
b= zeros(1,numel(y))
for i = 1:numel(x)
a(i) = r*cos(th(i)) + x(i);
b(i) = r*sin(th(i)) + y(i);
end
axis tight;
hold on
plot(a,b,'ob')
  7 Comments
madhan ravi
madhan ravi on 26 Oct 2018
Wow thanks Jonas completely agree with you , one thing experience is gained day by day :)

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jonas
jonas on 26 Oct 2018
If you have the image processing toolbox available, then there is a one-line solution to your problem.
viscircles([x,y],ones(size(x)).*r)
  6 Comments

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Jide Williams
Jide Williams on 26 Oct 2018
Ok, Thanks

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