I need help to plot circle around the points and these points are in a circle. please response

Question

Praveen Pawar 2016-10-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305843-i-need-help-to-plot-circle-around-the-points-and-these-points-are-in-a-circle-please-response

评论： Sindhuja john 2023-5-30

this code will generate points in a particular area

    n=10; % number of points that you want
    center = [2 ,2]; % center coordinates of the circle [x0,y0] 
    radius = 10; % radius of the circle
      angle = 2*pi*rand(n,1);
      r = radius*sqrt(rand(n,1));
     X = r.*cos(angle)+ center(1);
     Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.r')

and here is the circle can be drawn as...

    center = [2 ,2]; % center coordinates of the circle [x0,y0] 
    radius = 10; % radius of the circle
    angle = 0:.01:2*pi;
    r = radius;
       X = r.*cos(angle)+ center(1);
       Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.r')

Problem is that I want to plot circles around each point which are lying inside a given circle. Please help

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Answer 1

KSSV 2016-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/305843-i-need-help-to-plot-circle-around-the-points-and-these-points-are-in-a-circle-please-response#answer_237455

在 MATLAB Online 中打开

n=10; % number of points that you want
    center = [2 ,2]; % center coordinates of the circle [x0,y0] 
    radius = 10; % radius of the circle
      angle = 2*pi*rand(n,1);
      r = radius*sqrt(rand(n,1));
     X = r.*cos(angle)+ center(1);
     Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.r')
     hold on
     %%Draw circle 
     R = 1. ;  % radius 
     th = linspace(0,2*pi) ;
     for i = 1:length(X)
         x = R*cos(th)+X(i) ;
         y = R*sin(th)+Y(i) ;
         plot(x,y,'b')
     end
     hold on
     center = [2 ,2]; % center coordinates of the circle [x0,y0] 
    radius = 10; % radius of the circle
    angle = 0:.01:2*pi;
    r = radius;
       X = r.*cos(angle)+ center(1);
       Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.b')

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Praveen Pawar 2016-10-5

编辑：Praveen Pawar 2016-10-14

在 MATLAB Online 中打开

Thank you very much, sir, I tried it myself and it works,, again thanks for your response.

    % code
x =2; y = 2; r=10;
th = 0:.01:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
plot(xunit, yunit)
hold on
plot(x, y, 'gs', 'MarkerSize', 15, 'LineWidth', 2)
 n=7;
 radius = 10; 
 angle = 2*pi*rand(n,1); 
 r = radius*sqrt(rand(n,1));
 X = r.*cos(angle)+ x;
 Y = r.*sin(angle)+ y;
 plot(X,Y,'+r')
 for k = 1:length(X)     
     xc = X(k);
     yc = Y(k);     
     theta = 0:0.01:2*pi;
     rc = 2;     
     X1 = rc.*cos(theta)+ xc;
     Y1 = rc.*sin(theta)+ yc;
     plot(X1,Y1,'--k')  
 end
   hold off