optimize the number of cameras

Good morning i have wrote this code to see the covered points if we but the camara in a fixed place function C=OneCamera(x,y) for i=1:15 for j=1:15 x=1 y=1 d=(i-x)^2+(j-y)^2; if d<30 C(i,j)=1;else C(i,j)=0;;end end; C S= C(:)' end

i tried to do for loop so the variable x and y change when i and j reach (15,15) but it gave me errors

plz can you help