How to create a 3 diagonal matrix with blocks

I would like to create a matrix of the following form, ideally without having to use a loop as its size can become rather large:

basically it is an 2N x 2N matrix with a double wide 3 diagonal.

If anyone can provide some assistance in this it would be much appreciated.

Answer 1

[Voss]

N = 7;

M = zeros(2*N,N+2);
M( 1+(2*N+2)*(0:N-1) + reshape([0 1]+[0;1;2]*2*N,[],1) ) = 1;

disp(M);

     1     1     1     0     0     0     0     0     0
     1     1     1     0     0     0     0     0     0
     0     1     1     1     0     0     0     0     0
     0     1     1     1     0     0     0     0     0
     0     0     1     1     1     0     0     0     0
     0     0     1     1     1     0     0     0     0
     0     0     0     1     1     1     0     0     0
     0     0     0     1     1     1     0     0     0
     0     0     0     0     1     1     1     0     0
     0     0     0     0     1     1     1     0     0
     0     0     0     0     0     1     1     1     0
     0     0     0     0     0     1     1     1     0
     0     0     0     0     0     0     1     1     1
     0     0     0     0     0     0     1     1     1

[Johan De Jager]

Perfect, this should work wonders.

Thank you very much

[Voss]

You're welcome!