Plotting multiple objects on same axis

6 次查看（过去 30 天）

Jide Williams 2018-10-26

0
链接

此问题的直接链接

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

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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Kevin Chng 2018-10-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/426201-plotting-multiple-objects-on-same-axis#answer_343510

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.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

更多回答（3 个）

madhan ravi 2018-10-26

1
链接

此回答的直接链接

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')

7 个评论
显示 5更早的评论隐藏 5更早的评论

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.