Plotting multiple objects on same axis

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Jide Williams 2018-10-26

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评论： Jide Williams 2018-10-26

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

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Kevin Chng 2018-10-26

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编辑：Kevin Chng 2018-10-26

在 MATLAB Online 中打开

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.

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madhan ravi 2018-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/426201-plotting-multiple-objects-on-same-axis#answer_343508

编辑：madhan ravi 2018-10-26

在 MATLAB Online 中打开

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')

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jonas 2018-10-26

Yep, you are entirely correct in that it's a poorly written question. One of the things you learn on this forum is filling in blanks and interpreting ambiguities, which is actually quite useful when teaching :)

With that said, the notations r and the values of th (0 to 2pi) and the fact that OP accepted @Keving Chng's answer would imply that OP intended the radius to go as input.