Special matrix with zeros and ones

Hello Everyone,

I have a special matrix and can not create it in faster way

The example of a matrix is as follows:

m=[1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0;
   0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0;
   0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0;
   0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1]

I can build it up by using ones and zeros, but it will take me a long time to do that, specially when I have a very big matrix.

Thanks in advance.

[Jan]

I've formatted your code.

[James Tursa]

It's going to take us even longer unless we know the pattern rules. Can you explain a bit more about what the pattern is for a "very big matrix"?

Answer 1

[Jan]

Are you looking for kron?

kron(eye(4), ones(1, 4))

kron is not efficient. This might be faster, but less nice:

n   = 4;
ind = repmat(n, 1, n*n-1);
ind(n:n:n*n-1) = n + 1;
M   = zeros(n, n*n);
M(cumsum([1, ind])) = 1;

Answer 2

[Rodney Buller]

Have you given this a try?

m=zero[4 16] m(1,1:4)=1; m(2,5:8)=1; m(3,9:12)=1; m(4,13:16)=1;

Assign a matrix as large as you need then, assigning values afterwards. variable(row,column)=assignment val

[ABDULAZIZ]

Thank you,

This answer is correct , but it will take too much time for data entry when I have a very big matrix. Thanks again for your effort

Answer 3

[ABDULAZIZ]

Thanks Jan Yes 100%, that what I have been looking for. Thank you very so much.