Drawing a circle with known radius

How can i create a circle shape including 100 circles with known radius. Labeled with 4 different colors.

Answer 1

[KSSV]

th = linspace(0,2*pi)' ; 
R = 1; 
x = R*cos(th) ;
y = R*sin(th) ; 
% make groups 
G = zeros(size(th)) ; 
G(th >= 0 & th < pi/2) =1 ;
G(th>=pi/2 & th < pi) = 2 ; 
G(th>=pi & th < 3*pi/2) = 3 ; 
G(th >=3*pi/2 & th < 0) = 4 ;
gscatter(x,y,G,'bmgr','o')
axis equal

[Row Sarox]

Thanks, i have been struggling to change the colors.

[Image Analyst]

There is also a function called viscircles() you might want to know about.