N = 200 ;
R = 5 ;
C = [0 0] ;
th = linspace(0,2*pi,N) ;
xc = C(1)+R*cos(th) ;
yc = C(2)+R*sin(th) ;
%
R1 = 1 ;
% get three centers inside the circel
a = -R+R1 ; b = R-R1 ;
x = (b-a).*rand(3,1)+ a;
y = (b-a).*rand(3,1)+ a;
% get each cricle
figure
hold on
plot(xc,yc) ;
plot(x,y,'.r')
cx = zeros(3,N) ;cy = zeros(3,N) ;
for i = 1:3
cx(i,:) = x(i)+R1*cos(th) ;
cy(i,:) = y(i)+R1*sin(th) ;
plot(cx(i,:),cy(i,:),'r')
end
% Generate random numbers inside each circle
M = 100 ;
a = -R1 ; b = R1 ;
rr = cell(3,2) ;
for i = 1:3
rx = x(i)+(b-a).*rand(M,1)+ a;
ry = y(i)+(b-a).*rand(M,1)+ a;
idx = inpolygon(rx,ry,cx(i,:),cy(i,:)) ;
rr{i} = [rx(idx) ry(idx)] ;
plot(rx(idx,:),ry(idx,:),'.','color',rand(1,3))
end
