How can I fill a matrix in certain places with intervals?

Hi.

I need to make a matrix that resembles a chessboard, however the number of pixels and how many squares are going to be decided by the user. So far I've managed to do just that:

N = input('How many squares ')

L = input('How many pixels ')

tab = ones(L*N,L*N);

k = 1;

for i=1:N^2

if mod(i,2) ~= 0

tab(i:L,i:L) = 0;

end

I can only "draw" the first square. How can I do the others? I know it's a silly question but I'm new in MATLAB.

Answer 1

[KALYAN ACHARJYA]

N=input('How many squares: ');
tab=ones(N,N);
tab(1:2:N,2:2:N)=0;
tab(2:2:N,1:2:N)=0;
imshow(logical(tab));

[Guilherme Araujo]

Thank you! Can you explain tab(1:2:N,2:2:N)=0; and tab(2:2:N,1:2:N)=0;? Also, I need one more input, which is how many pixels each square has. How can I do that?