jak

while i ~= 511 || j ~= 511
if c >= 257 || d >= 257
break;
elseif j == 511 && i ~= 511
n(i, j) = f(c,d);
j = 1;
i = i + 2;
c = 1;
d = d + 1;
else
n(i,j) = f(c,d);
j = j + 2;
c = c + 1;
end
end