# Plotting multiple objects on same axis

23 views (last 30 days)
Jide Williams on 26 Oct 2018
Commented: Jide Williams on 26 Oct 2018
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

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.

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')
madhan ravi on 26 Oct 2018
Wow thanks Jonas completely agree with you , one thing experience is gained day by day :)

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)
Jide Williams on 26 Oct 2018
Thanks again

Jide Williams on 26 Oct 2018
Ok, Thanks

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