I need to plot circles with different radius and centers .Also I need to extract that information of centers and radius.

I am trying to produce circles of differents radius within a range and differents centers. I could make it to produce the radius but not the centers and I cannot make the plot. It showed "Matrix dimensions must agree". This is the code, I will appreciate any help you can provide me:

N=10;

R= randi ([5 20],1,N);

xs = [0 5 5 0 0] ; ys = [0 0 5 5 0] ;

th = linspace(0,2.*pi) ;

xc = R.*cos(th) ; yc = R.*sin(th) ;

x = R:2*R:S-R ;

y = R:2*R:S-R ;

[X,Y] = meshgrid(x,y) ;

% plot

figure

hold on

plot(xs,ys,'r') ;

plot(X,Y,'.b')

%

for i = 1:size(X,1)

for j = 1:size(X,2)

plot(X(i,j)+xc,Y(i,j)+yc,'b')

end

end

title(sprintf('Number of circles = %d',numel(X)))

Answer 1

[Mathieu NOE]

hello

no need to use meshgrid here (why ??)

try this instead

the centers and circles are plotted with same color here (but different color at each iteration)

N=10;
R= randi ([5 20],1,N);      % radii
xc = randi ([-5 10],1,N);   % x centers
yc = randi ([8 15],1,N);    % y centers
th = linspace(0,2.*pi) ;

% plot
CM = jet(N);  % See the help for COLORMAP to see other choices.

figure
hold on

for ck = 1:N
    xcircle = xc(ck) + R(ck)*cos(th) ;
    ycircle = yc(ck) + R(ck)*sin(th) ;
%     a=rand(1,3); % color triplet value , so below the center and the circle are plotted with same color (but different at each iteration)
    a=CM(ck,:); % color triplet value , so below the center and the circle are plotted with same color (but different at each iteration)
    plot(xc(ck),yc(ck),'Marker','*','color',a,'DisplayName',num2str(ck));
    plot(xcircle,ycircle,'color',a,'DisplayName',num2str(ck));

end
axis equal
title(sprintf('Number of circles = %d',N))

[Mathieu NOE]

hello

Problem solved ?

Answer 2

[Image Analyst]

Try this. Adapt as needed.

N = 10;
% Define circle parameters.
radii = 10 * rand(1, N);
x = 10 * rand(1, N);
y = 10 * rand(1, N);
% Plot centers
plot(x, y, 'r+');
% Plot circles
viscircles([x(:), y(:)], radii);
axis equal
grid on;