MATLAB: Inserting a circle at specific coordinates

MATLABplotting

I have a group of data, which when plotting gives me a circle. I want to have the circles center to be at (-1,1)in another plot of data.

How do i do this?

I hope someone can help me, thank you 🙂

Best Answer

Rasmus, for the general case (circle with noise) check out this entry in the File Exchange. The app will give you radius R and the center of the circle (xc,yc). With this data you can then simply

 t     = linspace(0,2*pi,100);
 x_new = R*cos(t) + xc_new;
 y_new = R*sin(t) + yc_new;
 plot(x_new,y_new)

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MATLAB: Draw circle with given data.

t=0:.1:2*pi;
radius = 3;
x=radius*cos(t);
y=radius*sin(t);
plot(x,y)
axis square

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

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')

Best Answer

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MATLAB: Draw circle with given data.

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

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