How can i draw a previously specified dimensions lattice ?

if i have a center point (xo, yo) and i want to draw a lattice of crossed circles similar to the following figure where the radius of the circle is (r)

Answer 1

[Robert]

Using x as your list of x coordinates and y as your list of y coordinates of the circle centers:

R = 1; % or whatever you like...
t = linspace(0,2*pi,100);
cx = R*cos(t);
cy = R*sin(t);

figure
hold all
for ii = 1:length(x)
  plot(cx+x(ii),cy+y(ii))
end
hold off
axis equal