How to create a wire of white dots

Hello, I am quite clumsy in Matlab. I want to make a wire of white dots on a black surface. Something like that:

1 1 0 0 0 1 1 0 0 0 1 1; 1 1 0 0 0 1 1 0 0 0 1 1;1 1 0 0 0 1 0 0 0 1 1;

but in a matrix 2500x2500; if I use:

array=zeros(2500)
for i=1:4:2500; 
for j=1:4:2500
array(i,j)=1; 
end 
end

then I only have one dot instead of 2; How to change it? What if I want 20 black pixels for 5 white?

Answer 1

[Thorsten]

N = 2500;

line_element = [1 1 0 0 0];
I1 = repmat(line_element, N, N/numel(line_element));

line_element = [ones(1,5) zeros(1,20)];
I2 = repmat(line_element, N, N/numel(line_element));

imshow([I1 I2])